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  #16 (permalink)  
Old 07-12-2013, 07:22 AM
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Gary, when you use the words "Astro T5" are you meaning a GM Astrovan T5; or an Astro Performance (brand), M22-style, aftermarket gearset? The Astro Performance (brand) gearset is rated similar to your engine. I nthink there is a bit of confusion between Astro (the van) T5 and Astro (the company) T5 aftermarket performance gearsets. No idea about Astro the dog, from The Jetsons.

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Old 07-12-2013, 09:59 AM
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the gm astro t5
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Old 07-12-2013, 10:35 AM
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I think an Astro Performance T5 gearset will fill your needs quite nicely. A guy on here builds all kinds of custom T5s. He'll also be at the Nationals. Let me see if I can get him in this discussion for you.
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Old 07-12-2013, 10:30 PM
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No T-5 for 1Gary

Sorry, there is nothing in a T-5 for Gary's Astro van.
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Old 07-13-2013, 05:55 AM
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I'm just saying Toni Mattle owner of a trans shop A & M automotive and a 40 yr vet showed me a 55 gallon drum filled with T5 tranny parts he took out in rebuilds of T5's.From what I have been told the case flexes and for that there is no fix.The 3th gen guys have said the same thing and gravitate towards the T56 even through at times shifting them can be problematic.

Now I'm with you.I hate it when some posts for suggestions from me and then turns around to tell me I'm wrong.Just hate that!!!.

Thing I guess I don't understand is how are the T56's useful in OEM applications with too low of a 1st gear and I guess too high of a 6th gear??. Could it be that those for the most part are mated to LSx engines that need to be spun up in the RPM range to get them into the power curve??. Don't know.Alot of those 3th gens have rear end ratio's in the low 3's.Wouldn't that bog down a LSx in 6th gear too on a engine that has a much higher power curve??. Confusing.
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Old 07-13-2013, 06:07 AM
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BTW-GM did put T5's in Astro vans with 4.3's from 1985 to 1989.They where and are kind of rare to find and for the pure Astro van lovers are considered a collector. Had a funky offset shifter and used a hydro clutch set-up.Those yrs have the support(mine is a 89)for the clutch peddle under the dash and the impression in the firewall for a knock-out for the clutch rod and slave cylinder. The clutch peddle is a-tad tight to the wheel well so size 13 shoes really don't work well for that.Mine are 10.5's.........LOL.


Side bar.......................really there ant anything to that old wise tale of shoe sizes and the size of anything else.Hehe!!
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Old 07-13-2013, 07:56 AM
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Strength of the T-5

I have 43 years of building Muncies, T-10's, Mopars, Saginaws, Ford Toploaders, and lately GM and Ford T-5's. I have never had a T-5 fail due to the case flexing. With too much torque and h.p. the main shaft breaks just in front of 3rd gear, but none of the gears become damaged. One of my customers runs his 5.0 Foxbody at Lebanon Valley with a stock Ford Motorsports T-5 (300 torque) with slicks and his trap speed is 128 MPH.

To date, since January 1, 2013, I have built and sold 19 GM T-5's with the Camaro V-8 gearing (325 torque according to B-W Automotive specs) using the S-10 tailhousing. Five of those actually utilized the Astro Performance Warehouse "rock crusher" gears. Please review my ad on Racing Junk. com.

Click on transmissions then on street transmissions and the ad title is "T-5 on steroids"

If case strength is a concern, G-Force sells a double thick-walled T-5 main case thru Jeg's Automotive.

Astro performance offers a billet chrome moly mainshaft for the T-5 for extra cost which raises the torque rating up to 575 ft. lbs. when using their gears.

Gear ratios are 2.95, 1.99, 1.34, 1.00, and .73 5th.

Go to Astroperformancewarehouse.com and search around for their A-5 T-5 transmissions and components.
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Old 07-13-2013, 08:06 AM
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Reed's new website under construction

For light entertainment log onto reedsperformancetransmissions.com and the only item which works presently is the gallery. Photos inside my shop in 2010.
Much more growth since then.
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Old 07-13-2013, 08:08 AM
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Sorry about the blooper!

Opps, the web address changed also. is reedstransmissions.com
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Old 07-13-2013, 08:16 AM
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Website link doesn't work yet

Sorry, website not up and running yet.
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  #26 (permalink)  
Old 07-14-2013, 04:07 AM
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Quote:
Originally Posted by Hogg View Post
Not sure I'd want a T-56 in anything with a 3.73 gear and 29" tires. 6th gear would be useless, 70mph would be only 1500rpm, lugging the engine.
For a T56 with 3.73 gears and 29" tires a 4.88 gear would give you a nice 70mph cruise at 1975rpm.

Also, cant he set something up to use 98-02 LS1 if someone had to?

peace
Hog
Quote:
Originally Posted by 1Gary View Post
I'm just saying Toni Mattle owner of a trans shop A & M automotive and a 40 yr vet showed me a 55 gallon drum filled with T5 tranny parts he took out in rebuilds of T5's.From what I have been told the case flexes and for that there is no fix.The 3th gen guys have said the same thing and gravitate towards the T56 even through at times shifting them can be problematic.

Now I'm with you.I hate it when some posts for suggestions from me and then turns around to tell me I'm wrong.Just hate that!!!.

Thing I guess I don't understand is how are the T56's useful in OEM applications with too low of a 1st gear and I guess too high of a 6th gear??. Could it be that those for the most part are mated to LSx engines that need to be spun up in the RPM range to get them into the power curve??. Don't know.Alot of those 3th gens have rear end ratio's in the low 3's.Wouldn't that bog down a LSx in 6th gear too on a engine that has a much higher power curve??. Confusing.

What I have seen done with a T5 and the reasons why I don't want one.I wouldn't mind down shifting out of 6th under certain cruise situations.As I stated the dyno sym from Richard is pretty strong right off idle,but the 383's are not known for great gas mileage.

AstroSafariVans.com • View topic - Ultimate Astro 5 speed manual transmission build

RPM HP TQ
1000 68 358
1500 116 408
2000 172 452
2500 225 472
3000 264 462
3500 301 451
4000 334 439
4500 352 411
5000 348 366
5500 310 296
Peak BMEP 186.1 @2500

Not great on hp as you can see that.Going to be talking to Richard/Pat for a possible revision of that.Maybe retard the cam or a head and cam choice change.But as you can see as it stands right now 358lbs @ 1,000 isn't too bad for use with a 6 speed and the 3.70 gears with a 29" tire. As I said a down shift to 5th wouldn't bother me much if in certain situations wouldn't be a bad thing.What concerns me most is the multi shift locations having the forward most location.The offset I spoke about is merely a u bracket to move the shifter up to 6" to the left.The GM Astro T5 shifter offset won't retro fit on a T56 and that is even if I could find one as I stated they are rare.
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Old 07-14-2013, 05:14 AM
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Old 07-15-2013, 03:23 PM
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I assume that your output estimates are at WOT, I wonder how the engine will do when asked to rev 1400rpm in 6th gear to cruise 65mph?
A quick blip down to 5th will bring the revs up to 2075 for 65 in case you encounter a hill so you shouldn't have a problem.

I ran 4.10 gears with 28" tires and a 4l60e for years, in a 4000 lb 97 reg cab 2wd GMC Sierra. Which would require 2250 rpm for 65mph which wasn't too bad, but if I had to cruise at 75mph that brings the revs up to 2600rpm which is a tad much.
It would have been nice to drop down into a 0.5:1 cruise ratio and rev 1850 rpm at 75mph. But more comfortable. Would still have a decent 4.10x2.66 10.9:1 overall 1st gear ratio.
The 3.06 x 4.1= 12.5:1 1st gear final drive ratio was very spirited.

To keep that 1st gear final ratio with the t56 I would need in between a 4.56 and 4.88 gear to stay in the 12.5:1 range. Getting the vehicle moving from a dead stop needs to be kept in mind as well. In the stock application, the T56 was used with a 3.42 gear and 26" tire, and they are doggy when getting the clutch out form a stop with the 2.66 x 3.42 = 9:1 1st gear final drive.

Yes you can tune the torque curve with the engine, but its much easier to tune with the rear gear. With your 29" tire, a 4.10 would be perfect, if I had your van and broke the 3.73's, I would slip a set of 4.10';s in possibly.

Let us know how she drive once she's all together. The proof is in the pudding. Sounds like a nice torquey 383 for sure.

peace
Hog
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Old 07-15-2013, 08:49 PM
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First thing I want to say is thank you Hog for hanging out on this thread.I appreciate that very much.

You did point out something needing more consideration.Your right those numbers are likely at W.O.T.I'm not sure how the dyno sym considers that.Maybe Tech can jump in here and answer that.Pretty sure Richard could answer that one.We did those numbers based off a carb set up.It project is likely to lead to a SFI which by their nature aren't known for HP,but are a torque y induction system.

This is a custom driver,camper,tow vehicle,that has some punch when I want to play and will still give decent gas mileage if I combo it right.
This van will get a 3" pipe body lift which makes service to the SBC a pc of cake and allows me options for the shifter location.Yes I am going to re-read the posts in the case I missed someone's post for a T56 that has multi shifter locations.


BTW this is a pic of a AWD and mine is a RWD.Same lift method.

It gets a tilt steering wheel with cruise and delay wipers.Custom comfort seats and sleeper.A serious look at a R & P to eliminate GM's poor engineering of idler arms steering which have been a issue with these vans the whole time they where built.Steel rear custom springs that are built on the basis of the Mopar Super Stock springs of yrs ago and rear swap bar.

All this allows for the 29" tires on all four.Oh yeah,a Ford 9" adapted to the Astro one of a kind offset with custom 31 spline axles drilled to the Chevy bolt pattern.I got a guy all lined up to take a stock Astro rear end and build a Ford 9 " for it.Of course a Ford 9" gives me the great opportunity to fine tune the rear end gear ratio.

This thread is a inquiry about the best but not a $5,000 dollar 6 speed to adapt a shifter location for a 6 speed.So much of this project is not OEM and the 6 speed tranny is one of the corner stones.Please help me find OEM uses of the 6 speeds that has the three shifter locations,what models,yrs where they used in.
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Old 07-17-2013, 11:09 AM
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I can tell you the T56 usage, but I don't know anything about the shifter locations.

1993 F-body(V8 Camaro/Firebird) equipped with 2.73 rear gear had ratios of
1st-3.36:1, 2nd-2.07:1, 3rd-1.35:1, 4th-1.00:1, 5th 0.80:1, 6th-0.62:1,R 3.28
Torque capacity rating of 350 lb/ft

1993 F-body equipped with 3.23 rear gear
1st 2.97:1,2nd 2.07:1,3rd 1.43:1,4th 1.00:1,5th 0.80:1,6th 0.62:1, R3.28:1
Torque capacity of 400 lb/ft

1994-97 F-Body-all rear gears(3.42 only in manual trans cars)
and
1998-2002 F-body, but uses the GEN 3 LS1 engine
1st-2.66:1,2nd-1.78:1,3rd-1.30:1,4th-1.00:1,5th-0.74:1, 6th-0.50:1,R-2.90:1
Torque Capacity rating=450 lb/ft


1992-2006 Dodge Viper V10 with torque ratings from 330lb/ft to 550lb/ft. (same ratios as the 94-02 F-body T-56)

20012004 Chevrolet Corvette Z06
20042006 Pontiac GTO
20042007 Cadillac CTS-V
rpo M12
1st 2.97:1, 2nd 2.07:1, 3rd 1.43:1, 4th 1.00:1, 5th 0.84:1,6th 0.56:1 R-2.90:1
04-07 Vette rpo MN6
1st-2.66:1,2nd-1.78:1,3rd-1.30:1,4th-1.00:1,5th-0.74:1, 6th-0.50:1,R-2.90:1

there are some Holden, Ford apps as well.

Tremec TR-60 60 took over in my 07,08 and 09.

there was also the ZF-S6-40 which was a manual 6 speed trans used by GM in the Vette from 1989-1996 in ZR-1 and non-zr1 applications
Gear ratios - 1st-2.68, 2nd-1.80, 3rd-1.29, 4th-1.0, 5th-0.75, 6th-0.50, Reverse-2.50
weighs 145 lbs with shifter

ZF6 trans info
Technical information on the ZF 6 speed

peace
Hog
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