Whine/squeak shifting into 3rd gear only

[msmall215]

'83 SC, now Rennshifter, new bushings, fresh coupler from Ed Mitchell (Coupler Whisperer.

Recently, my car developed a weird whine/squeak when shifting into 3rd gear only. If the car is off, no noise. I had a WEVO and the accompanying PSJ coupler on there and just installed a Rennshifter with one of Ed's couplers along with fresh bushings and the noise persists. Took it over to Jimtweet's place and we dicked around with adjusting the coupler every which way for 2 hours. Car shifts like butter, no slip, no grind, just smooth sailing.

We're both a little dumbfounded. Trans was out last year and gone over during EFI conversion, everything looked good. I would think if it was low on tranny fluid, I would be feeling it in more than one gear. Clutch feels fine too.

Anyone have any guesses?

[msmall215]

Any takers? Loose shift fork?

[john walker's workshop]

Pull off the plate on the bottom of the trans and see if the guide fork is loose. Take you 10 minutes.

[calidude]

My belt was loose and had something similar, added more shims to the front side of the cup washer and tightened it. No more squeak on gear changes...

[gomezoneill]

Can you tell where the squeak is coming from?

[msmall215]

Originally Posted by john walker's workshop

Pull off the plate on the bottom of the trans and see if the guide fork is loose. Take you 10 minutes.

Thanks John, will check the fork.

Originally Posted by gomezoneill

Can you tell where the squeak is coming from?

Hard to tell when driving...sounds almost like its coming from the shifter which doesn't make much sense. Same sound persisted through two different shifters.

[spuggy]

Originally Posted by calidude

My belt was loose and had something similar, added more shims to the front side of the cup washer and tightened it. No more squeak on gear changes...

Exactly what I thought on reading the title; for years, I could hear my fan belt "chirp" after shifting under power, usually 3rd and above, up or down. Nothing wrong with belt or tension - even changing the belt and adjusting to the tight end of "correct" it still did it.

This was the fix for me (needed the crank sensor for MoTeC anyway):



Serpentine Belt Conversion : Clewett Engineering, The complete solution for ignition & fuel injection