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Old 05-09-2009, 02:14 PM
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700r4 to 4L60E swap

Hi everyone, I have been curious about this for some time and just wanted to ask some questions. I currently have a 700r4 that I would like to swap out for a 4L60E. I am aware that I will need a different ecm and I have one capable of controlling it. Here are my questions.

1. Are the flywheel bolt patterns the same? The flywheel I have on now has the three bolt pattern for the torque converter and has no weight on it for balancing. Also, do the flywheel have the same amount of teeth?

2. The 700r4 that I have in now is the same length as the th350 with a 9 inch tailhousing. Is the 4l60e the same length?

3. How many splines does the output shaft have on the 4L60e?

I think these are all the questions but I doubt it. If I have more, I will post back.
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Old 05-09-2009, 05:20 PM
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Hi,
I hope this helps you.
Good luck,
Rich

http://www.hotrod.com/techarticles/1...ion/4l60e.html

Below from CHP mag.

Itís ironic that even though both of these strong overdrive transmissions come stock in all of GMís automatic-equipped new cars and trucks, not many of them are finding their way into early performance musclecars. Perhaps thatís due to their weight and high initial cost. Or maybe itís because theyíre hard to find used in the scrap yards and many people donít want to add a computer just to control the transmission. To make that task easier, JET Performance Products now offers a stand-alone computer-controlled system that will operate a 4L80-E transmission behind any carbureted or fuel-injected engine.

The 4L80-E Transconversion kit features its own computer with software that is custom-tuned to your vehicleís specifications, providing the proper shift points, shift quality, and lockup torque converter function. Its wiring harness has a built-in diagnostic port that will allow the connection of the modern scanning electronics present in any Chevrolet dealershipís garage to track down and diagnose any transmission-related problems. The JET system will not interfere with any existing computer systems you may have already installed in your vehicle
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Old 05-09-2009, 05:48 PM
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Well I just read through most of that post. Still not to clear on things. First of all, I am expecting my engine to make about 350hp and about 410 lb-ft of torque both at the flywheel. That article said they are rated at 360 lb-ft of torque. Is that 360 at the flywheel or at the wheels? Also, I did not see anything about the torque converter on the pre-97 4l60e's. I am guessing they still have the same 30 spline input of the 700r4's? I also did not see anything about the length of the transmission. I am still in the dark...
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Old 05-09-2009, 06:06 PM
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yes 30 spline input except for some v-6 ones such as in s-10 trucks



length of the 4L60 700r4 were always 31.5" overall= the same as the th350 with 9" tailshaft length. for some reason though pages online list them as around 30.5" long, but they are apparently not listing this as the actual overall length of the entire transmission.


not sure if any change to the length occured in 93 when they were changed to 4L60E

try wikipedia.com because there will be an article about this transmission's history on there.


have fun!

Last edited by fast68; 05-09-2009 at 06:19 PM.
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Old 05-09-2009, 06:11 PM
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Fast68 from what I saw here, http://www.gmautomatictransmissions....ansmission.php
it looks like the 700r4/4L60/4L60E are all the same length. I am still concerned about its ability to hold the torque. I don't want to use the 4l80e after looking at the difference in gearing. Mostly first and overdrive. I thought I have read somewhere that the 4l60e would hold up to what I want it to but I'm not sure.
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Old 05-09-2009, 06:17 PM
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I believe they upgraded it in 2001. It came with 5 pinion planetaries and a different sunshell.
I believe its referred to as the 4l65e.
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Old 05-09-2009, 06:17 PM
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probably are the same length yeah,

so as long as not from a corvette, or from a certain couple or few years caprice.

because those are around one inch shorter

good luck!
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Old 05-09-2009, 06:19 PM
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the 4L60e trans that does NOT have a bell housing that unbolts ..... is the same design shape - length as the 700r4 - 4L60 trans.

Converter bolt pattern is the same too.

Early design 3 piece case ( bell housing un bolts) 4l60E trans is the same too , but they may cost more money to purchase
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Old 05-09-2009, 06:29 PM
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Well, pretty much all but one question has been resolved. That is with the torque rating. Anyone know?
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Old 05-09-2009, 06:33 PM
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Quote:
Originally Posted by chevy_c10
Well, pretty much all but one question has been resolved. That is with the torque rating. Anyone know?

LOL..... torque rating?
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Old 05-09-2009, 06:45 PM
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I appologize. I meant, how much can this transmission take in terms of torque. Like I said above, I am expecting about 410 ft-lbs of torque at the flywheel and about 350hp. I know the hp is as important if really at all.
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Old 05-09-2009, 06:46 PM
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Quote:
Originally Posted by chevy_c10
I appologize. I meant, how much can this transmission take in terms of torque. Like I said above, I am expecting about 410 ft-lbs of torque at the flywheel and about 350hp. I know the hp is as important if really at all.

the internal hard parts of a 4L60e are the same ones in a 700r4 from late 1987 on up.
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Old 05-09-2009, 06:51 PM
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I had thought about using the 700r4 but I decided I wanted and electronic shift so I am not sure about the 700 either. I do not much about transmissions at all which I am sure is getting more and more apparent as this forum goes on. Do you think I will be ok with the engine modified and putting out those numbers with just a stock 4L60E/700R4?
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Old 05-09-2009, 09:39 PM
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Hi,
How do you see yourself driving this car, just as a cruiser daily driver, or are you going to pound on it? If you don't beat it on a regular bases, it (trans) may last quite a while, but if you plan on beating it you may as well build the trans before you put it in, there are quite a few pieces that have been beefed to handle way more power & torque then your engine puts out, like sunshels, dual cage input sprag, servoes, & the list goes on,
you just need to decide weather to build it now or later
Good luck,
Rich
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Old 05-09-2009, 11:30 PM
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Richard, at times the way I like to drive, I will be rebuilding it soon. lol. I found a list of stuff to upgrade. I will post it and if you would please tell me if I am missing anything.


4L60E 350.00
Oversize 35% and 50% servos 200.00
.500 Boost Valve 15.00
Raybestos Kevlar Band 23.00
8 Red Eagle Clutches with full thickness Kolene Steels 85.00
13 Vane Pump 39.00
Beast Reaction Shell 56.00
#38 Pump Slide Spring 5.00
#41 Servo Valve 18.00
29 Element Forward Sprag 45.00
Performance 1-2 Accumulator Spring 5.00
#19B Extra Wide Sun Gear Bushing 5.00
14x Clutch Release Spring 33.00
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