Manual Transmission T56 | T5 | MN12 | Clutches | Hydraulics | Shifters

replace 5th gear

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Old Dec 11, 2009 | 12:27 AM
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Default replace 5th gear

i just baught a used rebuilt t-56 for $900. it has 1000 mil on a fresh rebuild. sixspeed inc did the rebuild. i also know the tranny and kid who had it. so i know it not beat up.
the tranny needs 5th gear rebuilt. (may be just a syncro) Could I do the steps in the link all the way up to removing the 5/6 gear and put it back together?

Last edited by Turb0Z28; Dec 11, 2009 at 12:36 AM.
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Old Dec 11, 2009 | 12:28 AM
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https://ls1tech.com/forums/manual-tr...-write-up.html
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Old Dec 11, 2009 | 12:37 AM
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I have 4.10's in the rear could i put a higher 6th gear in for the highway?
also where should i look for parts?
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Old Dec 11, 2009 | 06:49 AM
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I just tok mine apart using that link and it leaves out a couple things but you will figure it out when you get in there. Also if you have anything busted in your tranny you should take it completely apart not just the back 2 gears. You might leave some loose metal in there to thrash other parts of your tranny.

Parts
www.thegearbox.org
check it out
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Old Dec 11, 2009 | 07:05 AM
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Originally Posted by Turb0Z28
I have 4.10's in the rear could i put a higher 6th gear in for the highway?
also where should i look for parts?
You can't get more than 0.50:1 with stock parts. And anything less and the gear would have to be smaller than the mainshaft.. :-p

https://ls1tech.com/forums/manual-tr...gear-swap.html
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Old Dec 11, 2009 | 08:22 AM
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Originally Posted by 85MikeTPI
You can't get more than 0.50:1 with stock parts. And anything less and the gear would have to be smaller than the mainshaft.. :-p

https://ls1tech.com/forums/manual-tr...gear-swap.html
That and the stress it puts on the unit would be a pretty good amount.
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Old Dec 28, 2012 | 02:18 PM
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The Trans is coming out this week. I looked at the T56 rebuild thread. Will it be ok to take the tail-housing off to look at 5th gear with out hurting anything? I want to get an idea of what parts i need to order. And just see how hard it is before I jump into it.
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Old Dec 29, 2012 | 04:00 AM
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When you remove the tail housing you should make sure to clean the gasket surfaces before you put is back together. A bead of silicon is NOT needed. Only a very thin layer as the tolerant between the housings is pretty tight.

You have to remove reverse and 6th to get to 5th. Overall it's not bad but make sure to check the 5/6 driven gear for ANY play on the shaft. It should be on there tight.

As far as gear ratios go, you are pretty much stuck with what you have without a major overhaul of the trans.
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Old Dec 29, 2012 | 08:06 AM
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I am going to stick with the stock gears. I swapped my 4.10s down to 3.42's since its a turbo car now. I was going to call The gearbox.org but they are closed till 2 jan.
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Old Dec 29, 2012 | 08:07 AM
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From what I am reading on line its a lock out problem witch would be the syncro . but 5th gear may be bad also
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