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Old 08-18-2013, 09:29 PM
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Trans swap question for 67 Impala

Was hoping someone could help me out with info.
I'm restoring a 67 Impala.
This car will not be raced or anything.
Just a highway cruiser. I want it to be happy to cruise all day at 65mph.
I bought it WITHOUT engine and trans, but I still have the tailshaft.

It used to have a 327 and 2-sp Powerglide.

I'm planning on dropping in a 275(ish)hp 350ci.

I WAS planning on a Turbo 350 trans 'cause I heard from a reliable source that it uses same mounts/crossmember/tailshaft as the Powerglide did, and I want the extra gear for the highway.

HOWEVER, Recently someone told me that the Turbo 700R4 also uses the same mounts/crossmember/tailshaft as the Powerglide did.
I had the T700R4 in my old Trans Am and I liked it. It revved low at highway speeds.
The extra cog in the T700R4 would be great but I want to keep the swap easy.

Can anyone confirm that the T350 and/or T700R4 are compatible with the same mounts/crossmember/tailshaft as the Powerglide?
Has anyone done or seen this swap before?

It's worth saying that I don't know the diff ratio yet.
Maybe also worth saying that car is going to remain a column-shift.
Probably also worth saying that although I live in Australia, the car is a Left-hand-drive and I won't change it. (So no weird **** going on because of relocating wiring looms, steering column, brake lines, etc, etc...)

Thanks to anyone with help.
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Old 08-18-2013, 09:47 PM
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Further internet searching has yielded this from Chevy High Performance Magazine's website.
I'll share in case someone else is interested.
I'd still like to hear from anyone who's done this, just for interest.

"The TH-350 is a direct swap for the Powerglide; both share transmission mounting positions, overall length, and spline count.

To switch a Powerglide to a 700-R4, use the ’Glide’s 27-spline output shaft, shorten the driveshaft 2.75 inches, and slide the crossmember back 1- inches."


Read more: Transmission Swapping Tech - Tech Article - Chevy High Performance Magazine
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Old 08-19-2013, 09:18 AM
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The TH350 has an extra gear but it is NOT a "highway" gear. It's a lower first gear for better off the line acceleration. The PG gear ratios are 1.76:1 first and 1.0:1 second. The TH350 is 2.52:1 first, 1.52:1 second, and the same 1.0:1 third. Highway RPMs will be exactly the same as with the PG. The only way to lower highway RPM is to use an overdrive trans like a 700R4. The 700R4 is NOT the same length or mount location as a PG, however, and will require relocating the crossmember and a custom driveshaft.
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Old 08-19-2013, 03:38 PM
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Thanks for that Joe.
I'm back to my original plan to use a T350.
I appreciate the info on ratios.
I'm cool with the top gear ratio in a T350, 'cause I'll probably be putting lower gearing in the diff.
2.77 or similar.
I just see too damn much mucking about with the T700R4.
And too many extra dollars.
Thanks again.
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Old 08-20-2013, 12:11 PM
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2004R Trany

Hi, If your going to get a built trany and do not currently have an OD on hand, the 2004R is very close to the dimensions of your PG or T350. You will most likely not have to shorten your drive shaft and the tail mount is very close to the PG and T350. A much easier install then the 700R4, but they do need a good rebuild with high end parts to survive significant horsepower.
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Old 08-20-2013, 12:26 PM
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X2 on using the 2004R,same length as the Powerglide,same driveshaft splines TV cable adjustment is critical on O.D. transmissions, this http://www.summitracing.com/parts/lok-kd-2200rht is very user friendly for that.
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Old 08-20-2013, 04:08 PM
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2004r

Thanks for putting this option out there. I've never seen one of these transmissions. But I'll do a bit more research now...
I found this abou them on the same website.

"The 200-4R overdrive trans has a 27-spline TH-350-style output shaft and is commonly found in ’81-’90 Chevy Monte Carlos, Malibus, El Caminos and Impalas. These transmissions are durable enough to withstand the punishment of the legendary turbo Buick Grand National from the factory. The 200-4R measures 27.75 inches, with a 26.81-inch mount position. To swap with the ’Glide, the crossmember must be moved back 6 inches. The good news is that the driveshaft will not have to be shortened."

Read more: Transmission Swapping Tech - Tech Article - Chevy High Performance Magazine
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Old 08-21-2013, 11:04 PM
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If you get a t-350 and the cruise RPM is just a little high,consider just using taller tires. If you change from a 26 inch tall tire to 29 inch tire,the difference in speed would be 58 MPH-64 MPH@ 2500 RPM
Thats if you have 3.36 gears in the rear.
if you had 2.7 gears the
26 inch tire= 72mph@ 2500 rpm
29 inch tire=80mph@ 2500 rpm
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Old 09-13-2013, 12:54 PM
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200 4r

A little late but thought i'd jump in. I put a 200 4r in my nova in place of the 350. It was a snap. No change in drive shaft. Moved my cross member back. Front holes were there and drilled two new holes. Had fun building my own and built it with extra clutches. It takes more money and time to do it, but that is what I wanted. Study the net and get the book on rebuilding.. If your not good at that, I would say the 350 maybe better for you.
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Old 09-13-2013, 01:46 PM
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If you want the best of both worlds; the 200-4r from a reputable builder is your best bet BY FAR. Use this with a 3.55 rear gear and life will be grand. Do NOT get greedy and think that your carbureted 350 will like 3.08s with the overdrive trans; it won't. You need to take into consideration that if the majority of your driving is "stop and go" you actually want a steeper rear axle ratio. This multiplies the available torque at a lower RPM/ In essence, it makes it easier for your mild 350 to pull away from a stop sign dragging a hefty car. This is made more murky by the fact you have a HEAVY car, 6 -lane interstates that are posted at 65+mph and short entrance ramps. You need to balance the quest for lower rpms, with enough torque multiplication to make the car safe and pleasurable to drive on the modern interstate.

This is why I would use a midrange axle ratio and the overdrive 200-4r.

2 builders of note for the 200-4r: Lonnie at extreme automatics and "JakeShoe" Jake's Performance. Both these guys are honest and reputable 200-4r specialists.

Option 2: Try to find a "TH350C" This is a 3-speed TH350 with a special "lock-up" torque converter to help give a little reduction in RPMs. Use this with a 3.31 rear axle and a slightly taller rear tire.

I prefer option 1 if you can afford it.
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Old 09-13-2013, 02:22 PM
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One of the reasons I chose the 200 r4 was that I didn't have to shorten the drive shaft. Didn't like the big drop from 1st to 2nd in the 700. But you have to put in lower gears in the rear because of the overdrive. I liked it because it gave me the lower rear gears for the hot rod and highway gear for going to car shows and touring. I like the 3.73 gears because it really worked well with the 2.74 first gear.
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Old 09-13-2013, 02:29 PM
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2004R Best Option

I concur with AutoGear. If your going to spend time and money on your 67 Impala and want to be happy at the end of the process, get the 2004R and match your rear gears to it (3.41, 3.55). The shoulda, coulda, woulda rule will come at you and you will wish you had done it right the first time

Next Item: Brakes: I have a 68 Impala Sport Coupe that I plan on changing to disc brakes. Started a thread on that about 6 months ago and got some good ideas. I plan on putting a C3 Corvette disc brake system on the car pending the wheel distances does not dramatically change. I will post my challenges or successes on that in the near future. Something for you to think about.
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