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Old 05-07-2011, 03:42 AM
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New T-350 rebuild makes grinding/scraping noise

Recently rebuilt by a local shop with a transtec rebuild kit, transgo shift kit, borg warner clutches and band, and a new converter (low stall/gas mileage tow converter). I flushed the cooler, and drove myself crazy making sure my converter was seated properly to the pump shaft.

Also, an NP205 was swapped in from the original 203 (went smoothly there).

Only happens when in gear and under load. If the t-case is in neutral, there is no noise, even when in foward or reverse gears. In Park or Neutral on the transmission (while in 2wd or 4wd) there is no noise. As soon as I put it under load (t-case engaged in any configuration, transmission in any gear) I get the noise. It sounds scarily like a bad converter install to me, BUT I know that not to be the case.

I quadruple checked on install, (double clunk to seat it, good spacing to the flexplate, freespinning TC both ways after bell was bolted up) and then pulled the flexplate bolts and shimmed it between plate and converter with 1/8" washers thinking maybe it was pulling on the flexplate too hard and causing runout. No luck. Converter still spun great with little to no effort when I took the bolts out to do this.

Feels a little soft for a shift kit and fresh rebuild also. Drove it about 2 1/2 miles trying to figure if it was just me or not, and decided to park it and not drive it anymore until I figure something out.

Any suggestions?

Been a long time, wheres the Doc at?

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Old 05-07-2011, 04:50 AM
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Maybe its scraping on the inspection cover?
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Old 05-07-2011, 04:54 AM
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Quote:
Originally Posted by Dizturbed One
Been a long time, wheres the Doc at?
If you are talking about docvette, he passed away several years ago.
Here's a link to a thread about him.
DOCVETTE HAS PASSED AWAY.....................

Jon
http://1972vega.wordpress.com/
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Old 05-07-2011, 06:23 AM
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Quote:
Originally Posted by Dizturbed One
Recently rebuilt by a local shop with a transtec rebuild kit, transgo shift kit, borg warner clutches and band, and a new converter (low stall/gas mileage tow converter). I flushed the cooler, and drove myself crazy making sure my converter was seated properly to the pump shaft.

Also, an NP205 was swapped in from the original 203 (went smoothly there).

Only happens when in gear and under load. If the t-case is in neutral, there is no noise, even when in foward or reverse gears. In Park or Neutral on the transmission (while in 2wd or 4wd) there is no noise. As soon as I put it under load (t-case engaged in any configuration, transmission in any gear) I get the noise. It sounds scarily like a bad converter install to me, BUT I know that not to be the case.

I quadruple checked on install, (double clunk to seat it, good spacing to the flexplate, freespinning TC both ways after bell was bolted up) and then pulled the flexplate bolts and shimmed it between plate and converter with 1/8" washers thinking maybe it was pulling on the flexplate too hard and causing runout. No luck. Converter still spun great with little to no effort when I took the bolts out to do this.

Feels a little soft for a shift kit and fresh rebuild also. Drove it about 2 1/2 miles trying to figure if it was just me or not, and decided to park it and not drive it anymore until I figure something out.

Any suggestions?

Been a long time, wheres the Doc at?

the problem is the shift fork/s in the transfer case. they get worn and when they do, range engagement will lock but, the fork still moves from the wear and will make the noise as your describing.
i know it seems like a lot of work, ut id suggest that you put the 203 back inand see if the noise is still there.

Last edited by tnsmith10; 05-07-2011 at 06:28 AM.
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Old 05-07-2011, 10:32 AM
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I pulled the inspection cover off Poncho, still there

Thank you for the info and link Jon, so sad... When I first came on here I read so many Docvette posts and learned so many little things daily from him. Long live the Doc

tnsmith - DAMN YOU. That makes so much sense... I just don't want to hear it, lol. Any way you can think of to check it somehow without pulling it? If not, guess I'll be rebuilding my newly acquired 205 soon. That 203 has a weird shifter box mounted on top that gave me so much trouble whenever it got mud in it... No thank you.

And lastly, would that damage my transmission to drive it? Since it is the t-case not allowing total engagement rather than low pressure in the trans, think I'm ok? I don't plan on driving it much until it's fixed, but I DO need to keep moving it around, I usually take it to the store for milk and such here and there (strict city officials, whenever I park it a couple weeks they try to tow me )
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Old 05-08-2011, 07:14 PM
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when will it rain???
 
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Quote:
Originally Posted by Dizturbed One
I pulled the inspection cover off Poncho, still there

Thank you for the info and link Jon, so sad... When I first came on here I read so many Docvette posts and learned so many little things daily from him. Long live the Doc

tnsmith - DAMN YOU. That makes so much sense... I just don't want to hear it, lol. Any way you can think of to check it somehow without pulling it? If not, guess I'll be rebuilding my newly acquired 205 soon. That 203 has a weird shifter box mounted on top that gave me so much trouble whenever it got mud in it... No thank you.

And lastly, would that damage my transmission to drive it? Since it is the t-case not allowing total engagement rather than low pressure in the trans, think I'm ok? I don't plan on driving it much until it's fixed, but I DO need to keep moving it around, I usually take it to the store for milk and such here and there (strict city officials, whenever I park it a couple weeks they try to tow me )
its not likely it will damage the trans, but not out of the question. best thing is to keep it in 4x4 for the short trips. just remember, the more you use it, the damage will happen and cost more to fix.
if your wonderingif the trans has proper pressure, hook up a 0-300 psi gauge to the main line port on the trans (driver side by the linkage) and see what the actual pressure is on the trans. the t-case will have nothing to do with a low pressure problem if it has low pressure.
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