nurkvinny Posted March 31, 2009 Report Share Posted March 31, 2009 Vehicle - 85 S10 Engine/trans - V8, 3500 conv, TH350 Rear - 9" maybe 200 miles on brand new build. Issue - start truck, truck goes into any and all gears, trans feels perfect forward and reverse. You can drive back and forth 400' long driveway 20 times, going from drive to reverse to N to park, to whatever, and no issues. No slipping. Hard launches feel great. Pull out onto the road, and truck stops moving. Truck acts like it is in N, little throttle or full throttle, truck won't move. But here is the kicker - the speedo registers 35-50mph while sitting still so the speedo gear is spinning. Put in reverse, and speedo goes counter clockwise back around to about 75mph. Spent 30 minutes pushing truck back to garage. Fired truck up and all gears feel perfect again. So, what could be broken / not meshing / not adjusted to cause this? The truck sits so fucking low I could not see if the driveshaft was spinning. No odd rear end noises at all. This is Kenny's old TH350 I got from Marc, and I do not know the history of it's guts. Quote Link to comment Share on other sites More sharing options...
Guest Removed Posted March 31, 2009 Report Share Posted March 31, 2009 drive shaft to short? rear diff issue? who built it? trans f'ed hard to say....odd to say the least Quote Link to comment Share on other sites More sharing options...
zeitgeist57 Posted March 31, 2009 Report Share Posted March 31, 2009 When it's not going anywhere, but the speedo is going, does it shift? Like, you hear it go from 1st, 2nd, 3rd on it's way to 75mph? Quote Link to comment Share on other sites More sharing options...
nurkvinny Posted March 31, 2009 Author Report Share Posted March 31, 2009 (edited) Yes, the trans is "shifting". The speedo reads like 20 in 1st, 40 in 2nd, 50+ in 3rd. Rear was built end-to-end, front to back by Mike Fouts at Slip-Tech (forget his name on here). Not that this pic helps, but it's pretty. - http://nurkvinny.com/images/Vehicles/Trucks/1985_S10/NewHousing4.JPG If anything, the shaft is too long. It actually slips in further than most all others I have seen. Again, a pic not that it helps - http://nurkvinny.com/images/Vehicles/Trucks/1985_S10/ShaftMED.jpg I should mention this has happened the last 2 times I have tried to go for a drive. I chocked the one late last year up to a freak occurrence. Edited March 31, 2009 by nurkvinny Quote Link to comment Share on other sites More sharing options...
Guest Removed Posted March 31, 2009 Report Share Posted March 31, 2009 no those pics dont help...it would almost have to be something to do with the shaft or rearend .cause the output is turning, and the drive line isnt , theres your sign.. now on a leaf sprung car, the springs wrap up and can cause all kinds of issues, and those spacer blocks dont help any Quote Link to comment Share on other sites More sharing options...
nurkvinny Posted March 31, 2009 Author Report Share Posted March 31, 2009 Posting the pics "to help" was a joke. I should also say that this trans/shaft combo has probably 500 miles on it and the rear has probably 200. So, it didn't start as soon as one of those pieces was added. Quote Link to comment Share on other sites More sharing options...
Guest Removed Posted March 31, 2009 Report Share Posted March 31, 2009 i understand, but it sounds as if something isnt right...and it would take some trouble shooting to figure out....for sure Quote Link to comment Share on other sites More sharing options...
nurkvinny Posted March 31, 2009 Author Report Share Posted March 31, 2009 Latest thing I'm wondering is if one axle or another is loose in the outer bearing and sliding out of the center section, so the posi is shooting all the load to the "free" spinning side when I turn left out onto the road, and once I push it back to the garage, it's slid back into the pumpkin? I don't know. From what I understand the speedo gear / tail shaft to look like inside a trans, isn't it a complete given that if the speedo is turning, the power is making it to the ass end of the trans? Quote Link to comment Share on other sites More sharing options...
AJ Posted March 31, 2009 Report Share Posted March 31, 2009 try turning right out of the driveway? lol Quote Link to comment Share on other sites More sharing options...
Guest Removed Posted March 31, 2009 Report Share Posted March 31, 2009 Latest thing I'm wondering is if one axle or another is loose in the outer bearing and sliding out of the center section, so the posi is shooting all the load to the "free" spinning side when I turn left out onto the road, and once I push it back to the garage, it's slid back into the pumpkin? I don't know. From what I understand the speedo gear / tail shaft to look like inside a trans, isn't it a complete given that if the speedo is turning, the power is making it to the ass end of the trans? yes thats what im saying. if the speedo is working then the trans is fine. its either the yoke is sliding off the spline on the trans, or the whole rearend could be sliding back and forth on the leaf springs, causing the shaft not to engage..understand what im saying now? Quote Link to comment Share on other sites More sharing options...
Guest Removed Posted March 31, 2009 Report Share Posted March 31, 2009 and i dont think it could be the axles, cause the bearings are pressed to them, and they shouldnt be moving at all! Quote Link to comment Share on other sites More sharing options...
nurkvinny Posted March 31, 2009 Author Report Share Posted March 31, 2009 try turning right out of the driveway? lol Why didn't I think of that? yes thats what im saying. if the speedo is working then the trans is fine. its either the yoke is sliding off the spline on the trans, or the whole rearend could be sliding back and forth on the leaf springs, causing the shaft not to engage..understand what im saying now? Yep. But... the shaft goes pretty far into the trans. The idiot as Zanesville joint and clutch actually made it like 3/4" too long, and I was worried it was actually too long. I will check all the u-bolt nuts on the leafs tomorrow. I can't imagine it is moving, but the list of possible causes is pretty short, sounds like. Can you think of any way something internal in the 9" center could cause this? I can't. Quote Link to comment Share on other sites More sharing options...
nurkvinny Posted March 31, 2009 Author Report Share Posted March 31, 2009 and i dont think it could be the axles, cause the bearings are pressed to them, and they shouldnt be moving at all! Funny you say that. On the original build, Mike actually put on too large of bearings, and one axle slipped out. He did however repair it for free with correct sized bearings and tacked them on. Quote Link to comment Share on other sites More sharing options...
Guest Removed Posted March 31, 2009 Report Share Posted March 31, 2009 Funny you say that. On the original build, Mike actually put on too large of bearings, and one axle slipped out. He did however repair it for free with correct sized bearings and tacked them on. theres a big difference in the bearing sizes for that, and they should have a collar on the outside of the bearing anyway, that press's on after the bearings do Quote Link to comment Share on other sites More sharing options...
Guest Removed Posted March 31, 2009 Report Share Posted March 31, 2009 Why didn't I think of that? Yep. But... the shaft goes pretty far into the trans. The idiot as Zanesville joint and clutch actually made it like 3/4" too long, and I was worried it was actually too long. I will check all the u-bolt nuts on the leafs tomorrow. I can't imagine it is moving, but the list of possible causes is pretty short, sounds like. Can you think of any way something internal in the 9" center could cause this? I can't. well same thing with too long, the splines may not be grabbing the splines on the output shaft if they are just to long. and yes, the crush sleeve could cause it or the axles not being long enough for the posi . im still thinking the blocks on the springs may be part of it. the u bolts can be tight, but if they are not located on the pin, they will move! Quote Link to comment Share on other sites More sharing options...
nurkvinny Posted March 31, 2009 Author Report Share Posted March 31, 2009 They're Strange brand axles and call for a "minus something" thousands press fit (can't remember the number of thousandths. Anyways, he fucked up and added a "plus" whatever number of thousandths bearing the first go round. He made it right and fixed it and apologized, stand up guy. I only hope it was done right the 2nd time. He came VERY highly recommended by more than one person. Quote Link to comment Share on other sites More sharing options...
Guest 614Streets Posted March 31, 2009 Report Share Posted March 31, 2009 sounds like a broken rear end or a trans tailshaft issue Quote Link to comment Share on other sites More sharing options...
Mattsv8 Posted March 31, 2009 Report Share Posted March 31, 2009 it sounds like a broken band. or the seals on the accumilator servo for it are leaking Quote Link to comment Share on other sites More sharing options...
Guest Removed Posted March 31, 2009 Report Share Posted March 31, 2009 matt, then how is the speedo still going to work? Quote Link to comment Share on other sites More sharing options...
nurkvinny Posted March 31, 2009 Author Report Share Posted March 31, 2009 The blocks have holes in them to seat around the pins. The pins are through the holes. I really don't think the rear end is moving on the springs. Here's a pic - http://nurkvinny.com/images/Vehicles/Trucks/1985_S10/NewHousing3.JPG Quote Link to comment Share on other sites More sharing options...
Qtr_pndr Posted March 31, 2009 Report Share Posted March 31, 2009 damn gm products j/k sounds like a head scratcher to me Quote Link to comment Share on other sites More sharing options...
Cordell Posted March 31, 2009 Report Share Posted March 31, 2009 (edited) What kind of locker/spool/posi is it? I had a locker do something similar to me, but it was a power-trax unit that replaces spider gears in a 10 bolt. I had to reinstall it because the teeth weren't meshing. I'm sure you aren't running the same thing, but the locker could screw up. Just a thought. Edited March 31, 2009 by Cordell Quote Link to comment Share on other sites More sharing options...
Guest Removed Posted March 31, 2009 Report Share Posted March 31, 2009 The blocks have holes in them to seat around the pins. The pins are through the holes. I really don't think the rear end is moving on the springs. Here's a pic - http://nurkvinny.com/images/Vehicles/Trucks/1985_S10/NewHousing3.JPG im wondering if the springs are just moving to much and the slip yoke at the trans is disengaging. do you have traction bars on this? Quote Link to comment Share on other sites More sharing options...
fattyona12 Posted March 31, 2009 Report Share Posted March 31, 2009 What if the shaft is too long the yoke is pushing past the trans splines when the car begins to move/under a load? Quote Link to comment Share on other sites More sharing options...
fattyona12 Posted March 31, 2009 Report Share Posted March 31, 2009 nevermind splines run all the way up pretty sure Quote Link to comment Share on other sites More sharing options...
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