My car is a 91 na. Yesterday i swapped in an r154, since my w58 gave out. Now my speedometer doesnt work. Its off by 10 mph and then it gets off by 15mph. Every other gauge works fine. Anybody else had this happen before to them?? Thanks
Speedometer Help!
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The Speedometer is mechanically controlled, It's just a cable that rotates from the transmission straight to your cluster. The Speedo cable is in three pieces:
A long cable from the cluster to the tranny tunnel, a short cable from the tranny tunnel to the actual transmission, and a small cylindrical gear inside the transmission. If any of the three parts is starting to wear, there will be play in the cable, any play will produce an inaccurate reading. Check each part. Spin one end, and make sure the other end spins just as well, with no play. Which ever part of the cable gives play is the part you need to replace.
A long cable from the cluster to the tranny tunnel, a short cable from the tranny tunnel to the actual transmission, and a small cylindrical gear inside the transmission. If any of the three parts is starting to wear, there will be play in the cable, any play will produce an inaccurate reading. Check each part. Spin one end, and make sure the other end spins just as well, with no play. Which ever part of the cable gives play is the part you need to replace.
So, the ratios would throw the speedo off?? Would it make a difference if i swap in a speedo from a turbo model?
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the n/a cars had higher gear ratios and the turbo cars had lower gear ratios. i got the same issue but its only about 5-6 mph fast
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Mine was making a god awful noise then stopped working all togethor, Would that be the cable from the cluster to the tunne?
Apologies for thread jack!
Apologies for thread jack!
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Might be the spring clip in the trans that holds the speedo drive gear. If that clips breaks it makes a terrible noise. Ask me how I know. You have to pull the extension housing to put a new clip in.... but first replace the speedo cable that was binding, or lube it... because that's what makes that clip break.
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cool thanks man!
Well mines off by 10mph, and after 50 its off by 15 , and after that im not sure. i checked the cable and it looks fine. Spins good, no noise. Its makin me mad, i dont wanna get pulled over for going over da limit.
Nocheez, you think that would solve my problem? I have the rear end from my other car i got the tranny from. I might get into doing that this weekend, since im off.
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For some reason I didn't even think about the whole W58 to R154 deal. I must have overlooked that note. Sorry. Like some others mentioned, the gear ratios are different. They're made to match the rear end, and when the gears in the tranny are not proportional to the gears in the differential and the gear on the speedo, then it'll read incorrectly. It doesn't seem to bother many people though. I know plenty of people who have swapped R154s in with the 4.30 rear end. Either way, if you have the rear end, you might as well swap it out.
That makes sense now. I wouldnt of thought of that being a deal with it. But thanks for the help guys. Im goin to work on it this weekend. Ill post up with my results once im done with it.
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Sounds good. I hope it works out for you.
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