deanosmod

I'm really confused on Mounting the right 4L60E trans to my 5.7 LS1 out of a 99 corvette. The crank Shaft is longer and is causing my concern. What year trany and what flex plate. Any help. This is all going in a 56 Chevy pick up on a Fat Man Chassis.

00pooterSS

iTrader: (40)

The crank isn't longer. It's a standard LS crank. A 4L60 from an F body or a truck should do the trick.

I'm not sure about the flexplate in the vette though, I believe you'll need a f body flex plate.

98CayenneT/A

A 4l60e out of a Ls corvette has a different input shaft.

You need a Ls 4l60e from 98 - 06 f body or two wheel drive truck. They have a 300mm input shaft and will have a bolt hole on the bell housing at the 12 o'clock position.

RonSSNova

iTrader: (3)

4L60 from a corvette mounts in the rear of the car via a torque tube.
It won’t mount to the back of an engine.
OP needs an Fbody or truck trans with matching flexplate

00pooterSS

iTrader: (40)

Just to clarify for the OP

98-02 f body
99 (new body)-06 truck

dlwilson

iTrader: (1)

I put a 4L60E from a 1998 Camaro behind an LS1 from a 2000 Corvette. I had to swap the flexplate to a Camaro flexplate.

deanosmod

Ok. Thanks everyone for the info. Now my transmission guy wants to build a 4L70E. Great. Now will one of those transmissions work? And were do I get it out of? He tells me that the 4L70E is a better stronger trans. Is that true? Thanks Deano

G Atsma

Actually he could build YOUR 4L60E into a 4L70E. From what I have learned it's a matter of different internal parts. Ask him about that.

98CayenneT/A

A 4l65e and 4l70e both have a 5 pinion front and rear planetary set.

In stock form they also have one extra clutch (7) in the 3-4 clutch pack. A 4l60e has (6). Which if doing a rebuild anyways is a non issue because you will more than likely set up your 3-4 clutch pack different than both those setups. Meaning for a performance application you can use a 6,7,8 or even 9 clutch set up and have much tighter clearances than stock.

How much power you plan on making ?

deanosmod

I found a 4L80E out of a 2009 van with a 4.8 engine. Will this work on my 99 LS1 vet motor?

93Z2871805

iTrader: (5)

With a crank spacer, GM flywheel bolts (1" UHL IIRC), a 19 to 17 pin harness adapter, and tuning (segment swap), yes it can work. How large is your trans tunnel?

deanosmod

It's all going in a 56 chevy pickup with a FatMan chassis. Using after market control box for ignition, injectors and transmission. I think it's called Fitech.

93Z2871805

iTrader: (5)

Does your system have the ability to control an electronically shifted transmission? If not, you will either need a controller for the trans, or it will need to be converted to full manual.

deanosmod

FITECH.com sells a complete package fuel, electrical and trans control box. $1700 with intake throttle body everything is included. Will this control the shifting and everything else. Is there different 4L80E transmissions? That's what I'm worried about. Different years.....I don't want to buy the wrong one. Thanks for your help. Dean-o

deanosmod

fitechefi.com

rlane5

I'm confused on the beginning of this post. You mention that the crank shaft is longer. The 99-2000 truck engine came with the longer cranks the cars came with the shorter crank, that was the issue, I had when I began my swap

Randy

deanosmod

Your Confused...LOL. I was told that the corvette LS1 has a longer crank than the Camaro. Then I wanted to use the 4L series trany instead of the 700R4. I had problems with that trany on my last build. LS1 on a 700R4 the shift cable (TY) gave me huge problems plus the flywheel and then needed a converter lock out kit. One big cluster F%^&&k. Now I'm seeing that the 4L80E is even worst because of the different years and which one will work with the LS1 engine. You need a control box so it will shift and all of that bull. OK. I think I'll stick with the 700R4 at least I know what's going to happen with that set up. Stick with the Carb and MSD box for the firing. It's period correct looking with the carb and Edelbrocks coil covers that look like BBC valve covers. OK. Now is everyone even more confused??

rlane5

With the longer crank you can still use any SBC trans but the flywheel MUST be flat, and not dished, and you can have the ECM programed for the trans. Either the crank was changed or the engine came from a 99-2000 truck, if the block is cast iron it's not a Corvette engine.

Randy

LS1MCSS

iTrader: (18)

The person that told you any year LS1 had a longer crank is absolutely incorrect. The only ones with a longer crank were the early 6.0.

64 sleeper

Also, be careful that whoever programs your Computer puts the correct trans pulse rate for the truck trans. The guys at PSI put in the corvette numbers and after spending months chasing every wire, sending the computer back to be re-set and almost trying a different trans, I brought it to a local shop and found out the computer had the corvette trans in it and it would think it was going 100 mph just as it start to roll and shift into overdrive. Changed the pulse rate in the computer and it started to work correctly. The 1-2 shift was too slow though so I ended up putting a corvette servo in trans. Now it shifts awesome. Good luck on the install.