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09-19-2007, 09:53 PM
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#1 (permalink) |
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Wrench Pimp
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Bad Thud in drivetrain, videos.......help
91 VR4. Makes a horrible thud as the drivetrain is engaged, or a load is applied and removed. if you pull the clutch out quickly it makes the thud and it feels thru the whole car. If I have the clutch fully engaged, just cruising and I tap the gas quickly and slightly , the thud will occur, as if there is play somewere in the drivetrain, and the taping of the gas allows it to go back and forth, if that makes sence. Very similar to a bad engine mount but Im sure its not a mount. if cruising in higher gears the thud is less intense when you tap the gas. I just rebuilt the tranny, the vcu dowel pins looked good, as did the teeth on the output shaft(both ends), I am thinking its coming from that area, but still don't know.
To recreate the thud sound for the videos, I am popping the clutch quickly, not fully letting it out, just poppin it in and out. Keep in mind during the vids. Car is jacked up. The first video is of the rear drive shaft section(camera pointing up from the ground) as I apply the clutch repeatedly to make the thud sound. Second video is of the first carrier towards the front of the car then onto the Transfer case, then directly underneath tranny, same scenario. doesn't look like the shaft is banging from bad carriers. Third video is with the Transfer case removed and popping the clutch. its not as intense i think maybe because of the load from the rear drive train is gone. Clutch is a cheesey XTD 6 puck(came with the car). I put a socket and rachet onto the output shaft to move it back and forth the see how much play. There is very very small amount before the front wheels start to spin, but the 4th video is of me moving the racket back and forth, almost making a clank sound in the tranny.....not sure if that is the cause or if its normal. I also have like 10-12 mm of play in the rear diff, which i am taking care of soon, that could be the thud, but it sounds like its coming from the front......idk Any ideas would be greatly apprecited. thank you for watching.
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12-12-2007, 08:31 AM
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#6 (permalink) | |
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Paid Member
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Re: Bad Thud in drivetrain, videos.......help
Quote:
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 93 Mustang GT, white 5spd- broke tranny, traded for: 91 Galant VR4, belize green 1189/2000 - broke tranny, sold 02 Focus SVT, black 3 door - drove it like I stole it for a month and traded for: 00 Mustang GT, dark red 5spd - a year of burnouts and donuts, sold 92 3000GT VR4 - safe for now  |
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12-12-2007, 10:57 AM
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#7 (permalink) |
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Never finished
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Re: Bad Thud in drivetrain, videos.......help
Wow very good helpful videos, unfortunately i was gonna say its something broken in the rear, because of how the rear sub frame bushings were jumping around, but after looking i say look at the front wheel driveshaft. In the 1 video the TC video still on the car it looks like the 1 half shaft is hitting something, cant really tell. But i would look at that and then double check the rear it wouldnt hurt. Good luck.
Edit: Other than that i would say you might've broke a set of pinion gears somewhere, or stripped your output shaft bein a 91 vr4...
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99 Chevy Silverado 2500
93 3000GT VR4 So far: 3sx TD05 E16g Turbo Kit, polished Greddy FMIC with IPS tdo5 extensions, Poopra pump, 3sx pulley, MSD wires, NGK coppers, Maximal powdercoated valve covers, polished plenum, Tial Q bov, Hallman Pro RX MBC, Maximal solid mounts, Maximal test pipe, JIC catback, Tein s-techs, Mod-Express 8k HID, Nelson TC bracket, PST CFDS, Fidanza flywheel, RPS Max street, Deft CF hood. Still Need: AEM EMS, injectors. |
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12-12-2007, 11:11 AM
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#8 (permalink) |
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Certified White Boy
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Re: Bad Thud in drivetrain, videos.......help
prolly need new carrier bearings, or a new shaft.
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1992 Dodge Stealth R/T Twin turbo AWD, Dynamic Racing stage II heads, 99 lifters, 6-speed Getrag from 99 vr4, Southbend Stage 4 DXD-B Clutch, TEC 15g's, Greddy blow off valve, Dejon Powerhouse Blow-Thru Intake Pipes, DSM sidemounts, Denso fuel pump, 550cc fuel injectors, Apexi SAFC, HKS VPC, Apexi AVCR, msd ignition dis-4, MSD 8.5mm wires, NGK coppers 1 stage colder, y-pipe, borla catback, ATR downpipe, highflow cat, Lowered, Nitto tires.
In the future: intercooler hard pipes, hopefully close to 500 horsepower after a good tune. When im rich: A second gen TD-05 VR4 monster. |
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12-13-2007, 04:30 PM
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#9 (permalink) |
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Wrench Pimp
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Re: Bad Thud in drivetrain, FIXED IT, VID AND PICS!
FINALLY got this taken care of. After adjusting the backlash in the rear diff and a new driveshaft and STILL having that clunking sound , I went through everypart in the drivetrain to check for play. I narrowed it down to somewhere in the center diff region by this method.........
Took the transfer case off exposing the output shaft. Now obiously you can't drive the car like this due too damage to the VCU, but what I did is just pop the clutch in and out real quick to try to simulate the clunk,.... this temporalily loads the drive train. car was on jack stands) NO CLUNK!! with the transfercase off. The splines on my output shaft on the TC side are in amazing shape, its the VCU side were the teeth were almost worn down to nothing and the dowel pins in the VCU were worn so bad, it was almost 3/16 in of play between the dowel pins and their respective holes. These two areas were the only areas in the center diff that would make that clunk. Check out these pics, then watch the video to see it in action. http://s97.photobucket.com/albums/l2...t=100_1799.jpg http://s97.photobucket.com/albums/l2...t=100_1801.jpg http://s97.photobucket.com/albums/l2...t=100_1798.jpg http://s97.photobucket.com/albums/l2...cture004-1.jpg http://s97.photobucket.com/albums/l2...cture004-1.jpg I'm not a master welder, but good enough to get the job done. Had to grind the weld down to get it to fit into the center diff housing, but I cut a V into the vcu and planetary gear set to get a nice deep weld so when i ground it down it would not remove substantial strengh. As a side note, I know alot of people ask about the "XTD" brand clutches..... The car had a new XTD clutch installed right before I bought the car, The 6 puck one. It was very harsh, but u get used to it and it held nice. The big problem was it had alot of play on the input shaft to the clutch disc splines compared to the OEM clutch I put in instead. That could be a clunk noise as well, idk. Hope this helps...... |
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12-13-2007, 08:22 PM
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#10 (permalink) |
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Forum Member
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Re: Bad Thud in drivetrain, videos.......help
Wow. Nice work.
This is something I've been trying to get to the bottom of for years now. See here: Backlash in the Transaxle?. Its strange though. Your dowel pin holes are really hammered out. My old VCU, as well as my new one, have holes that look pristine and I still have a load of slop from this part.
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'91 VR4 - Modlist: DR650R turbos, Snow stage 2D alky kit, DSM SMICs, blowthrough ported LT1 MAS, Dejon Tool intakes & y-pipe, Blitz DSBC Spec R, HKS SSQV BOV, PTE 580cc injectors, Dual feed fuel system with Aeromotive FPR & filter, Hotwired Supra pump, ek2mfg plenum spacer, HKS DLI, MSD Wires, Apex'i S-AFC II, MAFTranslator, Turbobob ECU, Scanmaster III, LC-1 WBO2, ESP downpipe, Vac/EGR delete, Gutted precats and test pipe, Maximal solid mounts, 300m 18 spline output shaft, Centerforce Dual Friction clutch, RPS flywheel, GC coilover conversions with helper springs, Powerslot slotted rotors, Goodridge SS brake lines, Hawk pads (front), Stillen metal matrix pads (rear)
Last edited by DoctorDex : 12-14-2007 at 08:26 AM. |
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