drive line clunk

[Cummins Cowboy]

i have a 93 D250 see signature. My truck has a audible clunk from the driveline right after the initial power is let out to the trans. It usually does this after switching from reverse to forward or vise versa. but it doesn't happen right when the power hits just right after. I pulled out the drive shaft and replaced all the u-joints and this did nothing to solve the problem. any ideas

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93 D250 5sp 3. 54 gears sans muffler, ISSPRO tach, K&N filter, needs to be bombed BAD
I would rather be cummin than stroken

 

[Big Don]

Sounds like ring gear and pinion has bad mesh. How many miles on it??

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Ol' Blue "First of the first gens: 1989 D 250 Ice blue met. 5 spd 3. 54, 155,000, Banks stage III powerpack, 3. 5" straight exhaust, pump adjustments, "'Ol Blue Special" injectors.
1999 3500 4x4 Chassis cab Emerald green ISB 5 spd 4. 10 K&N Filter straight exhaust 9 ft flatbed WARN fenderflares,Let, 275hp injectors installed, boost and pyro gages, VA plug'n power and Practical Solutions boost module. Jacobs E brake. Getting ready to install Banks Power Pack TLC!!
May buy another one in 2009!!
Check us out at:
http://donstractorrepair. homestead.com

 

[Cummins Cowboy]

sorry i left out the truck has 102,000 miles on the clock. it is a 2 wheel drive and seems to be pretty well taken care of b4 i got it. about a year ago

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93 D250 5sp 3. 54 gears sans muffler, ISSPRO tach, K&N filter, needs to be bombed BAD
I would rather be cummin than stroken

 

[fastmark]

pull the rear cover. You probably need to change grease anyway. If you have a dial indicator and a magnetic base, place the base on the housing surface that the cover bolts to and put the dial indicator on one of the teeth of the ring gear. You should have between . 004-. 009 play. If you have more than that your backlash needs adjusting. You ring and pinion might be worn. If this is hard to understand, a service manual has a very detailed diagram.

 

[BushWakr - RIP]

Mine did exactly the same thing. I took it to the dealer just before warranty ended and what they ended up doing is a bearing and shim kit. They said the allowable play (slop/backlash) as only 1 1/2 thousandths over max spec and that was what did the job. No problems since the re and re. What makes it sound worse they said was the hollow driveshaft amplifying the sound. MHO.
Regards, Bush'

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93. 5 D250 4X4,HD Spring Pkg, Rancho 7000's, Rear Swaybar,Dual Shock Front Stabilizer,BD Injectors,31/2" Mandrel bent exhaust,16cm 'Hot End',Modest Pump Tweaks/Timed,K&N Air,Isspro Pyro,Tach,transmission Temp,Auto Meter Oil Filled Boost Ga. , 3:54's, 4 Speed Auto, Clubcab, Aftermarket Reclining Buckets w/ctr Drop Down seat/console, Black over Silver, 21psi,285-65R-16's,American Racing Clear Coat Mags, Amsoil 15W-40HD Marine,12,000 lb. Warn Winch,KC Spots. 97,000 Kms.

[This message has been edited by BushWakr (edited 02-10-2001). ]

 

[Cummins Cowboy]

thanks for all the ideas. does anyone think this will hurt my rearend if i continue driveing it this way???

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93 D250 5sp 3. 54 gears sans muffler, ISSPRO tach, K&N filter, needs to be bombed BAD
I would rather be cummin than stroken

 

[Jones]

Hey cowboy, Depends on how much excess gear lash you're dealing with. Keep in mind the clunk you hear is one gear tooth building up momentum before it contacts (hits) the other one. I'm pretty sure that ring and pinion sets are only surface hardened so if it hammers its way through that . 003 to . 005 hardened surface, it'll wear faster. Don't mean to scare you but its always easier to fix little, early problems than to have to get a tow home. Hope this helps, Jones

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Jones
'84 Ramcharger w/CTD, non-gated 12, torqflite, NP205, Dana 60 and 70 w/ 3. 07s. Looks more or less stock, definately doesn't sound stock.