Looking changing the 42RLE to the non computer 4l60.
How long is the 42RLE trans?
Bell housing at engine block to TC face?
How long is the 42RLE trans?
Bell housing at engine block to TC face?
42RLE to 4L60 transmission swap question
- Thread starter JPHikr
- Start date
I don't have those measurements but this thread could get interesting. Is there a writeup for this swap? How do you handle the computer/TCM integration? I get that the trans will work fine if it's not expecting any computer inputs, but doesn't the computer expect info back from the trans on the 42RLE?
Interesting. I know there are aftermarket standalone TCMs for the 4l60e, not familiar with a "non computer" though. How do you mount the CKPS?
A hesco kit that puts it on the front of the motor?
Dang, I didn't even know that existed. I like it, assuming they are out there in enough quantity to have proven themselves not to cause nuisance cam/crank codes.
Ok,answered my own question. The non electronic 4l60 is a 700r4 renamed.
Adapters aren't cheap though.this- https://www.novak-adapt.com/catalog/adapters/engine-to-transmission/amc/kit-437amc5/
And a 700r4/4l60 with a gm np231 maybe? Or a shorter novak adapter to a jeep tcase.
Doesn't sound cheap,but depending on final length could be an interesting option for manual transmission tjs wanting an auto?
Adapters aren't cheap though.this- https://www.novak-adapt.com/catalog/adapters/engine-to-transmission/amc/kit-437amc5/
And a 700r4/4l60 with a gm np231 maybe? Or a shorter novak adapter to a jeep tcase.
Doesn't sound cheap,but depending on final length could be an interesting option for manual transmission tjs wanting an auto?
This.
The 231 is a long bastard of a t-case, so ANY length the 4l60 adds over a 43RE is gonna make your life more difficult with the TJs already comically short driveline.
Thank for the the NV3550 tip.
From Novack
The is 16.7" long and has a cast aluminum case with generous ribbing. With its removable Jeep I6 bellhousing, it measures 23.1
The 700 transmission has a main case of cast aluminum alloy with a length of 23-3/8" long.
The length looks that with the adapters it will be moving the TC about 1.5-2in further back.
We have a LJ so the rear driveshaft getting a bit shortened will not be a problem
From Novack
The is 16.7" long and has a cast aluminum case with generous ribbing. With its removable Jeep I6 bellhousing, it measures 23.1
The 700 transmission has a main case of cast aluminum alloy with a length of 23-3/8" long.
The length looks that with the adapters it will be moving the TC about 1.5-2in further back.
We have a LJ so the rear driveshaft getting a bit shortened will not be a problem
CreepinDeth
TJ Addict
Correct
How is it going to get its shifting input ??
Usually the 700R4s used a carb/throttle body mounted TV cable that if improperly adjusted , could burn it up quickly
"I don't have those measurements but this thread could get interesting. Is there a writeup for this swap? How do you handle the computer/TCM integration? I get that the trans will work fine if it's not expecting any computer inputs, but doesn't the computer expect info back from the trans on the 42RLE?"
I am gathering all the info I can to get the parts I will need to keep our Rubican running long after all the Computer and associated parts are NLA.
So far I have researched up and this is what I am thinking:
Engine timing will be with a standard 258 distributor and HEI module.
FI will be replace with a Offy 4 barrel manifold and a 600 CFM Holley fitted with the 3 barrel conversion and Willys float less carb system.
I am gathering all the info I can to get the parts I will need to keep our Rubican running long after all the Computer and associated parts are NLA.
So far I have researched up and this is what I am thinking:
Engine timing will be with a standard 258 distributor and HEI module.
FI will be replace with a Offy 4 barrel manifold and a 600 CFM Holley fitted with the 3 barrel conversion and Willys float less carb system.
If you want to get away from emissions compliance i would probably get rid of the amc as well. For pcm issues you could run a manual trans setup
Kind of a sideways swap IMO. Similar gear ratios, torque capacity and reliability. It's going to be a lot of work for not much gain of any.