transmission mount bolt sleeve size needed - The 1947 - Present Chevrolet & GMC Truck Message Board Network

DESTRO · 01-07-2009, 12:41 AM

Hello all
I'm trying to hunt down the size of the sleeve the trans mount bolts go thru.
It's a turbo 350 mounted to a np203 in a 77.

It's the sleeve that passes thru the two rubber mounts on the crossmember that the bolt passes thru before it his the threads into the adapter.
Replacing the mounts but the sleeves are missing and need to make a couple,just need the outside,inside diameter and the length.
I really hope someone can help.
Thanks

asphaltburner · 01-07-2009, 03:49 AM

Yo! DESTRO!
Not sure how much help I can be, but,...(wish I still had my donor truck filled with parts to go to the junkyard!)
Sleeves are a slip fit to the bolts, so that'll put you close on I.D., same thickness as shock sleeves, so that'll get you close on thickness (had to fabricate some similar sleeves for my NP205 frame mounting, and they were nearly identical other than length), and the length should be determined by the shaft length of your tranny mounting bolts. Sorry that I have no figures for you, but I SURE hope this helps. Not horribly critical tolerances, though. Perhaps others will have more info for you. Good luck, Todd.

DESTRO · 01-08-2009, 12:39 AM

Thanks for the reply. I was hoping someone had one laying around so I could get under there just one time but I guess I'm gonna have to break out the tape measure

James McClure · 01-08-2009, 05:35 AM

Destro, Whenever I need a sleeve like your looking for I resort to the plumbing section over to Home Depot. Most often you'll find that pipe nipples for 3\8" pipe work real good. Get them longer than you need so you can cut the threaded parts off. Buy the galvanized ones and grease the hell out of it before you put it in. jim

01-07-2009, 12:41 AM	#1
DESTRO Registered User Join Date: Jan 2007 Location: Buckeye state Posts: 168	transmission mount bolt sleeve size needed Hello all I'm trying to hunt down the size of the sleeve the trans mount bolts go thru. It's a turbo 350 mounted to a np203 in a 77. It's the sleeve that passes thru the two rubber mounts on the crossmember that the bolt passes thru before it his the threads into the adapter. Replacing the mounts but the sleeves are missing and need to make a couple,just need the outside,inside diameter and the length. I really hope someone can help. Thanks

01-07-2009, 03:49 AM	#2
asphaltburner Registered User Join Date: Jul 2008 Location: Ault, Colorado Posts: 862	Re: transmission mount bolt sleeve size needed Yo! DESTRO! Not sure how much help I can be, but,...(wish I still had my donor truck filled with parts to go to the junkyard!) Sleeves are a slip fit to the bolts, so that'll put you close on I.D., same thickness as shock sleeves, so that'll get you close on thickness (had to fabricate some similar sleeves for my NP205 frame mounting, and they were nearly identical other than length), and the length should be determined by the shaft length of your tranny mounting bolts. Sorry that I have no figures for you, but I SURE hope this helps. Not horribly critical tolerances, though. Perhaps others will have more info for you. Good luck, Todd. __________________ '78 3/4 ton 4x4 custom "Todd-built" FRANKENTRUCK!

01-08-2009, 12:39 AM	#3
DESTRO Registered User Join Date: Jan 2007 Location: Buckeye state Posts: 168	Re: transmission mount bolt sleeve size needed Thanks for the reply. I was hoping someone had one laying around so I could get under there just one time but I guess I'm gonna have to break out the tape measure

01-08-2009, 05:35 AM	#4
James McClure One shot, one kill. Join Date: Dec 2007 Location: Saratoga Springs NY Posts: 859	Re: transmission mount bolt sleeve size needed Destro, Whenever I need a sleeve like your looking for I resort to the plumbing section over to Home Depot. Most often you'll find that pipe nipples for 3\8" pipe work real good. Get them longer than you need so you can cut the threaded parts off. Buy the galvanized ones and grease the hell out of it before you put it in. jim __________________ 1984 K20 350M engine with 465,000 miles. Well, it's finally done!! Almost 2 years of work, but it was really worth the effort. Little stuff left to do is mount winch, wet sand & buff out and build belly pan\running boards. Body work takes lots and LOTS of beer!!!! God, Guts and Guns made America and God, Guts and Guns will preserve it! The worst thing you could do is get into my sights, but that don't matter, you'll never know it, cause you'll never hear the shotJim or Paladin whichever you choose.



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