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[philhoward]

Maybe - not that "up" on American stuff...

[ngrainqey]

lol it's a four speed but you can get upgrade kits that are 5 speed boxes, they're used upto the 94 corvette (C4) not sure what year they were made uptill but came in in '84 think it's the gearbox that the gm4/5L40/60E's replaced

[Kevin Wood]

you know when you tune the omega for example with the ar25 gearbox, what actually happens when you use too much power through it?
just cooks the oil or what?

The clutch packs and brake bands are not designed for the torque, so they slip a little, heat the oil, slip a little more, wear, slip some more, and the vicious circle ends with no drive.

I believe the AR35 has extra plates in the clutch packs to cope with more torque.

Kevin

[ngrainqey]

Just go for the latest non-electronic gearbox you can find...

ZF 4HP22?  It did fine on the Wife's XJS... lovely box!

iv just searched for gm5L40E and google came up with land rover forums etc saying it had problems blah blah but is the ZF 4HP22 a 5 speed?

might see if i can find one thats all

[philhoward]

The 4HP22 is a 4 speed (with lockup on 4th, as the AR25/35)- the problems arose with early boxes where a relief passage wasn't big enough to totally disengage the clutch packs if put into P or N after being in D - only a problem if the engine was subsequently revved over about 1500rpm, burning out the clutches.

Had an E28 BMW (525e) with an "early" box...started squealling upto 3rd gear after someone tried a "Playstation" starting manouver in it (i.e. drop it into N, rev the nuts off it, then hit D...)...he was new to Autos..

[ngrainqey]

lol on one of the forums they refered to the gm5l40e and the zf4hp22 asif they were the same gearbox (off the land rover l322)
anyway i dont really rev it for the sake of it in neutral or try setting off by revving in neutral and slamming into drive expecting it to spin the wheels lol, i did it by accident in the wet once but only revved it to about 1500 before i'd got it into drive

[philhoward]

4HP22 takes a max of 340Nm; just under that of an AR35, but no electronics to worry about...

[ngrainqey]

doh! i have an ar35 which is rather 350nm so no point going for a 4hp22 box as i'd be after something rated 400nm really