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3 speed to 4 speed conversion

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  • #1

    3 speed to 4 speed conversion

    Was wondering if anyone has any experience with 3 speed to 4 speed transaxle swaps. My 90 Lumina with a 3.1 and a 90 Buick Century (3.3) both had an option for the 4 speed (for V6 only) but was told by a junkyard that it was not possible. I dont uderstand why, other than maybe the computer has something to do with it. Can someone explain what will be involved with this?
    Thanks.
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  • #2
    The '90s were hydraulically controlled. I don't think it'll be much of an issue. You'll need the four speed transmission mounts, TV cable, shift linkage, and probably VSS. Different axles are likely in order as well, since there's a definite difference in size between a TH125 and a 440T4.
    Kaiser George IX: 1996 Buick Century Special wagon. 213-SFI. 250k miles. Never gonna give you up, never gonna let you down. First documented LX9 swap in an A-body! Click here to read my build thread!

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    • #3
      the wiring for TCC lock might be different. the computer controls that.
      Andy

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      62mm TB, 1.6 roller tip rockers, Ostrich 2.0, UD pulley, TB heater bypass, K&N, 180* stat, No cat, 99Grand AM dual cooling fans. 4T65E swap FDR 3.69, EP LSD, F.A.S.T. transmission controller, TransGo shift kit.

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