Is there a Dr. in the house?

[5cylturbojeep]

I am sure it has been covered and I have searched around. I have a problem with my configuration, motor,tranny,torque converter, diff gears, tire size. The motor is 617 TD the tranny is Jeep 3pd auto, the TC is stock Jeep but may have been changed to a low stall, the gears are 4.10, tires are 31 in tall.
Now, I have changed some of the stuff due to breakage. The tranny went out so it was re-built, while it was out TC was re-built. When it was put back together it was really slow of the line. I then changed the gears from 3.07 to 4.10 to help off the line. Now I can't take it on the freeway because it seems to rev to high(55 top speed). Before I get taller tires I need to make sure the Turbo is doing it's job (I don't want to end up right where I started). Is there anybody in San Diego that can help me by checking to see if my ALDA and Turbo is hooked up properly. The book I have doesn't cover it very well. The motor came out of a 82 car that drove fairly well but there was something wrong with the tranny (so not sure if everything is adjusted well).
ANY HELP WOULD BE GREAT. I can drive to meet if I don't have to get on the freeway. Thanks Jon

[WINGAS]

Not a ALDA/tubro anwer, but a mechanical one...

First, you need to determine the correct highway rpm for the vehicle with the desired size tires. Solve for rear gear ratio. Calculate it. Dont guess. ( the p/t finance prof in me speakin' ). Then changeit out.

When you mate a low stall converter with a numerically high rear end ratio you make it a lower stall covnerter. Identically( conceptually, not numerically) to pushing more TQ through it from the other side.

When you swapped to 4.10, you made it a "no stall" converter. Bad for any engine, death, I should think to a turbo'd one.

Reckon your desired final drive ratio with the tire size you plan on running. CHange the 4.10s out if nend be.

Before that, give that turbo some breathing room. While the ideal answer depends on the above number ( final drive ratio and 55 mph rpm ) ,roughly reckon you want 1800-2200 stall. A 3.42 cog wont mind that on the highway. You do not want a stall speed near your 55 mph rpm, as it will slip and generate heat needlessly.

So, a 3000 stall will "feel more like" a 2200 stall with 4.10, as opposed to 3.23's, for eg. but you want stall well below cruise rpm. I think thats what going on. The system's outta whack a mite is all. Calculate final drive ratio, given desired cruise rpm, and back into the correct stall speed. Swap the converter out first. Its the worse problem, imho.

[5cylturbojeep]

427L88,
Thanks for the insight. I tried to calc the rpm with the help of
4LO.com this told me at 55mph my rpm should be 2444 with the tires I have now. If I put 33in tires on it at 55 2296.

I didn't know about the relationship between the TC and the diff gears and stall speed is a completely odd thing to me. If I go to 35in tires at 65 the rpm is 2558. I would like to keep with 33in and that raises my rpm to 2785 at 65, if that is to high I will go to 35's because I have the room to do it.

I thought the motor didn't have enough torque with out the turbo working properly. I don't want to damage the motor if the TC is causing the problem.

Thanks for the help. I would still like to know if there is someone in SD that can or would be willing to check the conections for my Turbo and ALDA stuff.. anyone??