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n/a transmission rebuild

Old 09-29-15, 01:54 PM
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n/a transmission rebuild

from what i can tell, the syncros are going out on my 88 GXL. That and the input shaft bearing is screaming at me. Im looking uoo rebuild kits, and there apears to be two of them. a 20.5mm and a 15mm bearing on the counter shaft.

is there any way to tell which mine has without tearing the case apart?
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Old 09-29-15, 07:10 PM
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20.5mm

you will also need special tools however, can't get away with basic hand tools like you can on the engines.
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Old 09-30-15, 10:18 AM
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^ Interesting, but how do you know without taking the tranny apart? I've looked for this 'how-to-tell' info before, and am very curious. Nothing in the FAQ section.
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Old 09-30-15, 11:27 AM
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i've yet to see this "15mm countershaft bearing". even if there is such a thing it is likely only on the older trannies that were more random in their build characteristics.
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Old 09-30-15, 12:39 PM
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seen them on ebay

i looked closer at the listing and the title is a bit miss leading. they are for the 81-85 x7 and the 81-89 B2200. so the 20.5 is right.

as far as the tools go. i work at a chevy dealer, so i have access to a shop press and a few bearing splitters. anythign beyond that that i would need for the rebuild? ive rebuilt a few honda transaxles, this would be the first RWD trans ive don though.
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Old 09-30-15, 01:32 PM
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Thanks for the info Lyger.

Vartok - you'll need a long *** bearing puller...as in the arms will be very long. Imagine the puller center on the main shaft and the arms (or was it bolts?) on a bearing over a foot away. IIRC. More of a tool used in a tranny shop. Your dealer may not have one.
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Old 09-30-15, 04:24 PM
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Originally Posted by Vartok View Post
seen them on ebay

i looked closer at the listing and the title is a bit miss leading. they are for the 81-85 x7 and the 81-89 B2200. so the 20.5 is right.

as far as the tools go. i work at a chevy dealer, so i have access to a shop press and a few bearing splitters. anythign beyond that that i would need for the rebuild? ive rebuilt a few honda transaxles, this would be the first RWD trans ive don though.
you need a special bearing puller for the rear output shaft bearing. you might find something that will work from a GM special tool but you'll be spending a bit of time experimenting. a bearing splitter will not fit in there.

i had to make my own from a generic 3 jaw puller and fabricated the arms to extend them about 1.5-2 feet.

Last edited by RotaryEvolution; 09-30-15 at 04:28 PM.
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Old 10-01-15, 08:31 AM
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Originally Posted by RotaryEvolution View Post
you need a special bearing puller for the rear output shaft bearing. you might find something that will work from a GM special tool but you'll be spending a bit of time experimenting. a bearing splitter will not fit in there.

i had to make my own from a generic 3 jaw puller and fabricated the arms to extend them about 1.5-2 feet.
wow yeah, i dont think we have anything like that. Im also not real good at fabing things up like that.
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Old 10-01-15, 09:24 AM
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Originally Posted by Vartok View Post
wow yeah, i dont think we have anything like that. Im also not real good at fabing things up like that.
I will post a photo tomorrow of what i made to remove rear bearing is easy to make
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Old 10-01-15, 10:04 AM
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other than the long puller for the rear bearing, can i get by with a bearing spliter and a shop press?
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Old 10-01-15, 10:28 AM
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for the rest you should be able to, some bearings will need a small puller that may need the jaws ground down. a splitter can easily damage the gears if you aren't too careful.
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Old 10-01-15, 01:05 PM
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I think you should upgrade to the s5 tranny way smoother when shifting.
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Old 10-01-15, 01:31 PM
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Originally Posted by FC3S Timmy View Post
I think you should upgrade to the s5 tranny way smoother when shifting.
what is this magical difference between the S4 and S5 transmission that is an "upgrade"?

there is none, it really just depends on how much the transmission has been abused.
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Old 10-02-15, 01:37 AM
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Here is the bearing puller I made is 5mm x 2"angle iron with 17" long all thread amd a universal puller at other end
Attached Thumbnails n/a transmission rebuild-dsc02138.jpg   n/a transmission rebuild-dsc02136.jpg   n/a transmission rebuild-dsc02137.jpg  
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Old 10-08-15, 11:10 AM
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so would i be better off just getting a new trans rather than making tools to rebuild this one?
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Old 10-08-15, 12:18 PM
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Originally Posted by Vartok View Post
so would i be better off just getting a new trans rather than making tools to rebuild this one?
that is up to you, afaik there is no new transmissions anymore. parts to build a new one would be... expensive, assuming they're all available. you could either find tools to work, fabricate them, or have a transmission shop rebuild it, or do the disassembly items you need.
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Old 10-08-15, 04:49 PM
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Search ebay. I've seen Bearing and synchro kits on there. Aftermarket iirc. Other parts may be found also. New from mazda...what he said ^
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