Input shaft bearing

tysen86 · 01-10-2013, 01:57 AM

My 91 sounds like it has a bearing going out in the tranny. I makes the sound in 1,2,3,5 and neutral. When I shift into 4th it's just as quiet and smooth as you could want. I have a couple questions; first, could an input shaft bearing be causing this and if so, why not 4th gear? Second, can a country boy like myself change and input shaft bearing or does it require some special pullers? The best way I know to explain the sound is, it sounds exactly like the throw out bearing did when it was shot and the clutch was let out. It's definitely a bearing.

While I got ya, if anyone knows where there is a tranny sitting in or around North Georgia, I could probly use it!!

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Terrys87 · 01-10-2013, 02:26 AM

My spare tranny that I was hoping was good does just the oppistite of yours. All gears are great except 4th gear. Almost sounds like exact same noise you are saying only mine is 4th gear only.

I dont know about changing input shaft, but I to am on the hunt for a tranny.

hambob · 01-10-2013, 02:43 AM

If it were the input shaft wouldn't make the noise in all gears? Just a thought. Have you checked the tranny oil?

Pat8942 · 01-10-2013, 03:31 AM

It could be the input pilot bearings, they are the rollers inside the input shaft, it would make noise in every gear except direct (4thgear) because the input turns a different speed than the output in every gear except direct.

tysen86 · 01-10-2013, 04:11 AM

Ok, so it could be the input pilot bearing, is this something I can change or do I need special tools?

Thanks for the input.

ThatGuy1295 · 01-10-2013, 05:55 AM

You probably could change it. But I would just have the whole trany rebuilt at this point. Way worth it, compared to changing out one bearing and having the next one go out later. Tearing a transmission out 4 times in 4 years is a joke.

tysen86 · 01-10-2013, 07:02 AM

Yea, I'm looking for another tranny so I can have this one rebuilt.

tysen86 · 01-10-2013, 12:04 PM

Ok, my next question is, how do I find out if I have a G or a W tranny? And is one better than the other?

tysen86 · 01-10-2013, 12:05 PM

Oh, there is not a data tag on the firewall.

highonpottery · 01-10-2013, 02:11 PM

mine had bad input shaft bearing. had noise in all gears but 4th, as well as in neutral (4th is direct gear) - sounded like marbles jangling around inside. decided it was best to just get it rebuilt. shop tech sent me a pic of my chewed up input shaft splines where 40-50% were broken off....yikes.

Bigblock · 01-13-2013, 02:39 PM

Could be the gears.4th really is not a gear so it cant make noise unless a bearing is bad.How much trans oil have you been adding?

tysen86 · 01-13-2013, 02:45 PM

I added a quart yesterday. it don't ever leak. only leak on the truck is the rear main and its a small leak.

01-10-2013, 02:26 AM	#2 (permalink)
Terrys87 Registered User Personal Sales Rating: (1) Join Date: Aug 2008 Location: Anderson Missouri Posts: 4,449	My spare tranny that I was hoping was good does just the oppistite of yours. All gears are great except 4th gear. Almost sounds like exact same noise you are saying only mine is 4th gear only. I dont know about changing input shaft, but I to am on the hunt for a tranny. __________________ Wifes 88 4Runner Rebuild Completed-Upgrading when possible. :) http://www.yotatech.com/f199/terrys8...99/index8.html My 86 4Runner Rebuild http://www.yotatech.com/f199/terrys8...chance-247386/ My 85 Extra Cab Build http://www.yotatech.com/f198/85-extr...rusher-263813/

01-10-2013, 03:31 AM	#4 (permalink)
Pat8942 Registered User Personal Sales Rating: (0) Join Date: Jun 2012 Location: Deming,NM Posts: 172	It could be the input pilot bearings, they are the rollers inside the input shaft, it would make noise in every gear except direct (4thgear) because the input turns a different speed than the output in every gear except direct. Last edited by Pat8942; 01-10-2013 at 03:32 AM.

01-10-2013, 05:55 AM	#6 (permalink)
ThatGuy1295 Registered User Personal Sales Rating: (0) Join Date: Jan 2011 Location: 46 50' 36.82'' N 122 19' 41.01'' W Posts: 1,572	You probably could change it. But I would just have the whole trany rebuilt at this point. Way worth it, compared to changing out one bearing and having the next one go out later. Tearing a transmission out 4 times in 4 years is a joke. __________________ . . . Wheeler 89 3.0 http://www.yotatech.com/f199/thatguy1295s-89-a-247953/ DD 01 Taco 3.4 http://www.yotatech.com/f200/thatguy.../#post51885770

01-10-2013, 02:11 PM	#10 (permalink)
highonpottery Registered User Personal Sales Rating: (0) Join Date: Aug 2007 Location: Citrus Hts., CA Posts: 1,352	mine had bad input shaft bearing. had noise in all gears but 4th, as well as in neutral (4th is direct gear) - sounded like marbles jangling around inside. decided it was best to just get it rebuilt. shop tech sent me a pic of my chewed up input shaft splines where 40-50% were broken off....yikes. __________________ 1993 X-Cab 4wd -- 2002 UZJ100 Land Cruiser -- 2001 Corolla S -- 2006 SV650s -- 2006 Accord Hybrid Axial Toyota RC Scaler

01-13-2013, 02:45 PM	#12 (permalink)
tysen86 Registered User Personal Sales Rating: (0) [OP] Join Date: Dec 2005 Location: Jasper, GA Posts: 161	I added a quart yesterday. it don't ever leak. only leak on the truck is the rear main and its a small leak. __________________ 1991 PU bone stock. Engine is bored .020, .010 off the head, .010 off the top of the block, ported, pollished, and completely ballanced (I think thats all, I can't remember). Just needs a cam. "I understand the Jeep thing.....it's broke down!"

01-10-2013, 02:43 AM	#3 (permalink)
hambob Registered User Personal Sales Rating: (0) Join Date: Dec 2011 Location: Toronto,Ontario Posts: 47	If it were the input shaft wouldn't make the noise in all gears? Just a thought. Have you checked the tranny oil?

01-10-2013, 04:11 AM	#5 (permalink)
tysen86 Registered User Personal Sales Rating: (0) [OP] Join Date: Dec 2005 Location: Jasper, GA Posts: 161	Ok, so it could be the input pilot bearing, is this something I can change or do I need special tools? Thanks for the input.

01-10-2013, 07:02 AM	#7 (permalink)
tysen86 Registered User Personal Sales Rating: (0) [OP] Join Date: Dec 2005 Location: Jasper, GA Posts: 161	Yea, I'm looking for another tranny so I can have this one rebuilt.

01-10-2013, 12:04 PM	#8 (permalink)
tysen86 Registered User Personal Sales Rating: (0) [OP] Join Date: Dec 2005 Location: Jasper, GA Posts: 161	Ok, my next question is, how do I find out if I have a G or a W tranny? And is one better than the other?

01-10-2013, 12:05 PM	#9 (permalink)
tysen86 Registered User Personal Sales Rating: (0) [OP] Join Date: Dec 2005 Location: Jasper, GA Posts: 161	Oh, there is not a data tag on the firewall.

01-13-2013, 02:39 PM	#11 (permalink)
Bigblock Registered User Personal Sales Rating: (0) Join Date: Dec 2004 Location: So MS Posts: 998	Could be the gears.4th really is not a gear so it cant make noise unless a bearing is bad.How much trans oil have you been adding?

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01-13-2013, 02:45 PM
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