Crossmember Differences:700R4 & 4L60E
Thread Starter
Joined: Dec 2000
Posts: 2,341
Likes: 151
From: Cincinnati,Ohio
Car: 1991 BandittII Firebird
Engine: 5.7 HSR
Transmission: 700R4
Axle/Gears: 3.27 9 bolt
Crossmember Differences:700R4 & 4L60E
i recently won what looks like a Spohn tranny crossmember on ebay.they claimed that this crossmember is used in a LS1 4L60E swap into a 3rd gen f-body.my question is how much of a difference is there between the 700R4 and 4L60E crossmember mounting points?i know i'll have to do some fabrication just want to get an ideal as to what i'm gonna need to do to make it work with a 700R4.
Supreme Member
Joined: May 2004
Posts: 2,924
Likes: 1
From: Kingston, Tn
Car: 1987 GTA
Engine: LT1
Transmission: T56
Axle/Gears: 9 bolt 3.70 posi
AFAIK there are no differences. You can use the 700R4 crossmember for the 4L60E. It's the T56 that requires a different crossmember. Spohn doesn't make a crossmember for the 4L60, only the T56
Thread Starter
Joined: Dec 2000
Posts: 2,341
Likes: 151
From: Cincinnati,Ohio
Car: 1991 BandittII Firebird
Engine: 5.7 HSR
Transmission: 700R4
Axle/Gears: 3.27 9 bolt
Originally Posted by 91banditt2
any one else wanna throw in their 
Member
Joined: Jun 2004
Posts: 383
Likes: 0
From: Wanatah, IN
Car: 1990 TA, 1995 Sierra 1500
Engine: 305tpi to LT1 mod, 305 TBI
Transmission: 4L60E with 3000 Stall, 5spd
i also thought that the 4l60e and 700r4 were the exact same, i have had both trannys and they looked identical to me.
Moderator
Joined: Jan 2000
Posts: 20,981
Likes: 11
From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Originally Posted by Leader_One
i also thought that the 4l60e and 700r4 were the exact same, i have had both trannys and they looked identical to me.
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