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05-02-2016, 06:28 PM | #1 | |
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help please
I own a 1986 Chevy caprice with a 305 and 700r4 Trans and it's no good (the trans) am I able to put a 700r4 from a 1991 caprice also with a 305 in to my caprice?
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05-02-2016, 07:44 PM | #2 | |
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Re: help please
A TH700-R4 will fit. Just measure the tailshaft housing length and count the splines. It's also likely that the '91 version will have a TSS in place of the speedo drive gear, but that can be exchanged.
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05-02-2016, 08:01 PM | #3 | |
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Re: help please
Thanks for the info if the tailstock on mine is different length I need to switch them correct? (As long as splines match) and with the speed sensor I can switch with tail shaft correct?
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05-02-2016, 08:43 PM | #4 | |
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Re: help please
The spline count MAY be different (of may not be). By the records I could find, the change to a higher spline count was in mid-1984, so you are probably O.K. in that regard. However, trucks are a different animal, so stick with a car trans.
If it is different, you can tear down the trans and replace the tailshaft or get a driveshaft / yoke to fit the spline. If the '91 has a VSS as I suspect, it can be removed and the '86 speedo driven gear and carrier installed in its place using the '86 clamp and thimble. You will have to inspect the drive gear on the tailshaft to make sure it is compatible. Some had straight teeth or a reluctor wheel, and some had the plastic helical gear like your '86. You may have to swap those by pulling the 4 bolts and tailshaft housing.
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05-02-2016, 08:47 PM | #5 | |
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Re: help please
Thank You Very much super helpful
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05-13-2016, 03:49 PM | #6 | |
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Re: help please
If i put a tubro 350 Trans in my 86 caprice I'll have to move the cross member and possibly shorten drive shaft how to I get the speedo to work
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05-13-2016, 04:16 PM | #7 | ||
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Re: help please
Quote:
Having said that, you will be happier with a TH700R4 in that car, if for no other reason than the 3.06:1 ratio first gear.
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05-14-2016, 11:37 AM | #8 | |
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Re: help please
305 CU with a thm350 tranny is not a good match . good for a smaller car like a camaro not a full sized sedan. 305 lacks torque. 350CU with the thm350 would be a better match more torque . stay with a repaired 700r4 with the 305.
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