NX74LS6

I'm trying to weigh the pros and cons between the 700 and the 4L60e. The 700 is about $300 cheaper,no core charge ($300), can accept a mechanical speedo, and slightly more durable from what I've heard. But I need an expensive adapter ($250)because of the different flexplate(the 700 plate is flat but the 4L60e is slightly conical.) It would be great to use the 4L60e flexplate on the 700 but I don't think it would fit. It would be a little harder to fab the throttle linkage for the 700. Has anyone used the LS1/700R4. Any feedback would be greatly appreciated.

Keith

Same transmission. The 4L60E is computer controlled, while that 700R4 is throttle valve controlled. If you can tune around the absense of a transmission like you could with a T56. I see no problem other than missing one bolt to hold the tranny to the engine.

vr1967

Here is a link to a page that has a picture and GM pn for a flexplate that is supposed to mate the LS1 to a 700R4.
Price from GM Partsdirect is about $75.
http://www.turbols6.com/gallery/album02?page=2

HTH
Virgil

MrDude_1

iTrader: (4)

you'll have to eliminate some of the trans codes from the PCM, but keep the trans lockup intact..

then repin a connector with the LS1 trans wires to run somthing for the lockup converter.

plus, you WILL need a VSS... the 700r4 will burnup on the road without the converter locked up, and for the PCM to lock the converter, it needs to know the speed of the car.


solutions i can think of:
run a VSS in the 700R4... then get a electric speedo.
run a VSS in the 700R4... then get a box to spin the cable with a motor to match the VSS speed. keep your stock speedo. this option would eliminate the money saved by going 700R4

run a cable in the 700R4.. then get a VSS to work off of the spinning cable.. in thirdgens, the GM did this by having the VSS sensor attached to the back of the speedo.


personally, i would run the 4L60E.. everything will work correctly.. the 4L60E is a modern, more reliable 700R4... the only downside is the speedo doesnt work.

then i would either get the electric signal to cable speedo converter box at a later date, or i would get a electric speedo. in the meantime, the car is still drivable, and a laptop running scannign software can substute for a speedo on a temp basis.

Speartech

iTrader: (14)

The 4L60E is worth the extra money. Being able to precisely program the shift points and shift firmness far outshines the old fashion T.V. cable system of the 700R4.

The strength of these transmissions has continually evolved over time. Todays 4L60E is stronger than the 700R4 of 1993 (the last year it was used in production).

Either can be built for more strength, but the repeatable and programmable shift points of the 4L60E can't be duplicated in the 700R4.

If you do go 700R4 there are much cheaper ways of adapting it than spending $250.

Midnight

iTrader: (19)

I have a 700r4 out of a '91 Syclone in my '78 Firebird and have had nothing but success with the new tranny combo. I like have the OD cause it really helps out with the 4.10's out back. The way i have my lockup setup is that i have it wired to my brake switch. So the moment i hit the brakes the converter goes out of lockup. Works really good. You can wire it that way, and then thats all you have to do to swap a 700r4 in a 2nd gen F-Body minus the moving of the crossmember and shortening the driveshaft.

lrmneil

I have just finished the M6 to 700R4 swap in my 2002 Z28 and went with a 3k stall and love it so far thera was a bit of modifing to do.

NX74LS6

Here's a quick update. The adapter kit from advance adapters is $105 including the flexplate. A universal TV cable is about $25. I can use my factory speedo, delete the VSS (hp tuner), Throttle cable mounting shouldn't be that hard and according to the tech guy at monster motorsports I'll be saving about 20-25 lbs with the 700 don't know if thats true but it would be another bonus. One things for sure I'd be saving around $650 going with the 700R4 and that money can be used elsewhere.

LS1XJ

I bought what was supposedly a flexplate that will work to bolt up the 700 to the ls1, I also bought the spacer and bolts. I had to open up the holes on the flexplate for the torque converter. It all bolted up ok, so we will see how it works out. Also I am not running lockup in the 700, so all I have to worry about is a vss and tv cable which are taken care of.
Dustin

Blase4x4

? Is the flex plate on a ls1 the same as a 02 6.0l?