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Thread: '91 4.9 swap into a rear drive application?

  1. #1
    chiros is offline Cadillac Owners Member
    Automobile(s): '90 Cadillac Seville
    Join Date
    Oct 2007
    North Central Massachusetts

    '91 4.9 swap into a rear drive application?

    I'm thinking my spare 4.9 would be a great swap into my mint '82 Chevy S10 2wd sb. I'd planned to use a chevy small block, but I love this Cadillac engine, and it may be a better package all around, what with the lighter weight, low profile, etc. Obviously a fwd to rwd swap, probably use a 4L60E, need to fabricate mounts, etc. Anyone know if the rwd trans will bolt up? Anyone done this swap, or one like it??

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  3. #2
    Edahall's Avatar
    Edahall is offline Cadillac Owners Enthusiast
    Automobile(s): 93 & 88 Allante, 88 Eldorado
    Join Date
    Jan 2004

    Re: '91 4.9 swap into a rear drive application?

    Nope, the 4L60E transmission will not bolt to the 4.9L. You'll probably have to make an adapter to get it to mate up. You might want to give a call. They might have what it takes to get this to work. Yes, I agree the lighter 4.9L would be a better all around package in your S10. Good luck.

  4. #3
    The Ape Man's Avatar
    The Ape Man is offline Cadillac Owners Connoisseur
    Automobile(s): '80 Fleetwood Coupe, 1994 and 1995 Mercedes 140 Coupe
    Join Date
    Feb 2005
    Southern NJ

    Re: '91 4.9 swap into a rear drive application?

    There WAS a guy fabricating RWD swaps to replace the HT-4100 with a 4.9. IIRC they used the HT-4100 RWD block with all the wet sleeves and other parts from the 4.9 to get the bellhousing needed. I have not heard about these in the last 5 years. It was on the WWW a while back. Great idea especially if an updated PROM came with the other parts.


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