2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

S4 and S5 trans. differences?

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Old May 14, 2003 | 10:34 AM
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From: WATERMAN,IL
S4 and S5 trans. differences?

What differences (if any) are there in the S4 and S5 Turbo transmissions? Manely inquiring on the diameter of the bellhousings.
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Old May 14, 2003 | 11:58 AM
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RX-Heven's Avatar
I'll blow it up real good
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From: San Francisco, CA
Gear Ratios, mounting bracket (crossbrace), ribbing on the case itself, oil fill locations are all different. They do however bolt up in any combo. One is not really stronger than the other with the exception of the crossbrace which the s5 is better, but it still sucks.
Bellhousings are the same
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Old May 14, 2003 | 03:23 PM
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from what I understood, if you were to say...put a s5 turbo tranny on a s4 NA, you would need

series 5:
turbo clutch
starter
modified driveshaft

that's what i've read, could be wrong though.
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