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Thread: Overdrive for a '79 425?

  1. #1
    jaber is offline Cadillac Owners Member
    Automobile(s): '79 425 engine/'75 Jeep
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    Overdrive for a '79 425?

    Did Caddy ever mount a 700r4 to the big blocks?
    I just put a 425 into a Jeep truck and was wondering what my options would be as far as getting an OD that has the Caddy BB bell. If they did use a 700, I could swap tail shafts and still use a t-case on it.
    If anyone has any info, I would greatly appreciate it.
    Thanks in advance.
    Jeff.


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  3. #2
    BRUCE ROE is online now Cadillac Owners Fanatic
    Automobile(s): Eldorado
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    Re: Overdrive for a '79 425?

    The 425 ended production in 79, with a THM400 trans. Bruce Roe

  4. #3
    deVille33 is offline Cadillac Owners Connoisseur
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    Re: Overdrive for a '79 425?

    I believe the 700r4 was used briefly behind the Olds based diesels in pick-ups. They didn't last, cause the owners were replacing them with TH400s.

  5. #4
    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: Overdrive for a '79 425?

    Advance adapters used to make an adapter for that (BOP to Chevy)

  6. #5
    jaber is offline Cadillac Owners Member
    Automobile(s): '79 425 engine/'75 Jeep
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    Re: Overdrive for a '79 425?

    Quote Originally Posted by deVille33 View Post
    I believe the 700r4 was used briefly behind the Olds based diesels in pick-ups. They didn't last, cause the owners were replacing them with TH400s.
    Thank you for this. It gives me hope....
    I will repost if I can find out for sure.

  7. #6
    nickinvegas777's Avatar
    nickinvegas777 is offline Cadillac Owners Member
    Automobile(s): 1978 De Elagnce coupe
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    Re: Overdrive for a '79 425?

    wow lots of caddy guys could use this info,
    i am going on a hunt tomorrow what year of truck would you say maby 81 to 84 ?
    chevy gmc diesel ? i so want a 700r 4 in my 78 coupe!

  8. #7
    ferrisworld is offline Cadillac Owners Fanatic
    Automobile(s): 1979 Sedan Deville
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    Re: Overdrive for a '79 425?

    If you want a manual there's a bop bellhousing available for the t56.

  9. #8
    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: Overdrive for a '79 425?

    I don't think those diesel trucks had 700r4's. I worked on my father in laws enough that I should remember but not quite. His either had the plain old th350 or possible the 200r4 like all the ninety eights and Cadillacs. Any Jeep engine swapper should be familiar with Advance Adapters. They can put almost any trans behind almost any engine.


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