i have a question my friend has a 86 ta and went from a 700r-4 to a 350 turbo and a week later the speedo quit working.... i was wondering ... why also its tpi car and he gets a vss code on the ses light??

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1989 firebird formula

Mods: converted from T.B.I. to a carburator 305 to a 350. Flowmater exhaust,hedman shortie hedders,202 heads,350 horse cam,bored.40 over, Edlebrock torker2 intake.

Future mods 400 performer rpm intake (polished) and 600 edlebrock carb, comp roller cam, and way better heads. orpossibly a 383 stroker?

 

th-350's don't have a vss. I don't know how the speedo would have worked at all as it requires a vss for speed input

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82 z28 350cid, vortec heads, comp 262h cam, Holley 600cfm carb, 2in twice pipes, MSD ignition, turbo 350 trans, 3.73 posi, manly b&m megashifter

 

The 350 turbo is not a normal 350 turbo....it's modified to fit where a 700R4 used to be! A 350 Turbo Transmission is shorter than a 700R4 so when the transmission was built a modification kit had to be bought! The kit not only extended the length of the transmission but also allowed the 700R4 tail end to be mounted as well.....therefore, MY 350 turbo DOES have a VSS!! The speedo worked for for about 2 weeks and then stopped! I think the problem is just the gear inside the rear end housing!
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1989 firebird formula

Mods: converted from T.B.I. to a carburator 305 to a 350. Flowmater exhaust,hedman shortie hedders,202 heads,350 horse cam,bored.40 over, Edlebrock torker2 intake.

Future mods performer rpm air gap intake (polished) and 600 edlebrock carb, comp roller cam, and way better headsa 400 defintely in the works!

[This message has been edited by burnoutrpm (edited January 16, 2001).]

 

Hey I have got the same tranny. I got it from Fort Dodge transmisions in Iowa. It is a TCI. That is weird how they ad on to the input shaft in the trans. Does yours have a spacer that goes on the tailshaft. That fits in between the tailshaft and the trans. Alot of people have never seen such a thing. Kevin

 

burnoutrpm, something's definately up inside the tailshaft. The tailshaft cable drives the speedometer. The speedometer drives the 1986's VSS. (I know; I have an '86.) Later model cars had the VSS in the tailshaft, and had electronic analog speedometers.


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
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