91 R/T won't shift

[DanEboy5]

What you could do before you throw more money at it is read out the diagnostic codes.
If you know how to read the ECU codes with a meter the transmission codes are very similar except that you ground pin 10 then connect the meter (-) to pin 12 and the meter (+) to pin 6. (the ECU codes are pin 1 )
The list of codes is long, post up what you get and I'll look it up.
(or you could download the manual from 3SX )

Yeah this is something I am going to do. It will be my first with these codes. I do think I have an old multimeter...somewhere.

[DanEboy5]

If at first you don't succeed, then you don't succeed the second time...try a third time and bam, it works! The third tcu fix my shifting problems. It shifts quite well actually. I tried to get the codes and it would not stop sweeping (the multimeter). So, according to the book it was another bad tcu. It's funny how I came across the third tcu. On my way to Sears to get another analog multimeter (old one took a huge SH!T), I drove past a guy I knew was parting out a 91 SL. I had thought he had junked it by now. He had the garage open and there it sat. A few phone calls, a deal with a mutual friend and I am up and running!

Now I have a bad front end vibration at 60mph+... OMG does it ever end???

[IPD]

are your wheels balanced? that could be a vibration problem.

[Steve '92ES]

If it just started happening out of the blue make sure you don't have snow/ice/crud packed into your wheels. Pretty common problem in the winter, see if a run through the car wash fixes it

[DanEboy5]

Yeah I just checked the front-end and all is tight. This car has a hound from every town for tires! It's more then likely the tires out of balance. No snow packed in due to it being in the garage most of the winter so far.

[stealthee]

Did you make sure the lugnuts are tight? Did you lose a wheel weight?

[DanEboy5]

Did you make sure the lugnuts are tight? Did you lose a wheel weight?

Well I hope my 750lb/tq impact gun gets them tight! lol I have only drove the car up and down the block as few times since I got it. I have my original wheels and tires from my 92 R/T TT that I am going to put on. The regular R/T wheels are ugly IMO. This should tell me if I have a problem or not.

[stealthee]

Tightening wheels with an impact is a bad idea. Overtightening is a bad thing and you have no control over am impact.

[DanEboy5]

Tightening wheels with an impact is a bad idea. Overtightening is a bad thing and you have no control over am impact.

Well normally I agree. However these are just some old rims and and I am sure overtightening isn't causing the vibration. I will torque the TT rims when I put them on and cross my fingers!

[stealthee]

Overtightening wheels can warp the rotors though, so even if the wheels are shit, its still important not to overtighten.