Adrien/Matt,

Thank you for the replies. I went ahead and got the FD out the the pinion is SLOPPY. Moves side to side quite a bit. Matt- I got in touch with Walt and while he no longer has the tools, he did have an extra 3.07 unit lying around. We are going to trade since he only needs it as a core. That way I can at least get this thing on the road and decide if/when I want to upgrade to one of the higher ratios at a later date.

I know there is concern that if the pinion bearing is loose, there is a risk to the trans output. There is a MINISCULE amount of play as seen in this video: https://youtu.be/DqV15SPho1k

Is this anything to be worried about?

We rebuild several. Units a month and find most of the pinion main bearing
shot .
We replace ALL the bearings.
Since we warranty them for 80,000 miles our people know what is critical .
Lot of the cores we get back have issues that require slight modification
before we can rebuild them.
I'm surprised we were not contacted about this as we are the major
rebuilder and supplier of the Final Drive units and LSD .
Should visit our web site and see portion of what we do.

On Tue, Mar 10, 2020 at 12:01 AM Adrien Genesoto via Gmclist <
gmclist@list.gmcnet.org> wrote:

> To be correct the trany output shaft shouldn't wobble that much, if the
> pinion has no side play it may be usable
> as is. Guru Manny would be the ultimate word on this. Right now the trans
> case is room temp with that amount of play, it would be interesting to
> recheck that shaft side play at operating temp.
>
> Try to get a plug with a magnet, or put a magnet on the outside of the
> cover. Now is the time to add a drain plug.
> Hope this has help you.
>
>
>
> uprooted wrote on Mon, 09 March 2020 15:08
>> Adrien/Matt,
>>
>> Thank you for the replies. I went ahead and got the FD out the the
> pinion is SLOPPY. Moves side to side quite a bit. Matt- I got in touch with
>> Walt and while he no longer has the tools, he did have an extra 3.07
> unit lying around. We are going to trade since he only needs it as a core.
> That
>> way I can at least get this thing on the road and decide if/when I want
> to upgrade to one of the higher ratios at a later date.
>>
>> I know there is concern that if the pinion bearing is loose, there is a
> risk to the trans output. There is a MINISCULE amount of play as seen in
>> this video: https://youtu.be/DqV15SPho1k
>>
>> Is this anything to be worried about?
>
>
> --
> Adrien & Jenny Genesoto
> 75 Glenbrook (26-3) Mods LS3.70 FD / Reaction Sys / 80mm
> Front&Intermidiate / Hydroboost / 16" Tires / Frame Rebuild / Interior
> Rebuild
> Yuba City,Ca. Text 530-nine-3-three-3-nine-nine-6
>
> _______________________________________________
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
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Jim- to be honest we haven't even had this thing on the highway yet. I want to get a 3.07 FD back in there to see what we are working with before making the decision on what gears to go with and spending the $$. At that point I would likely reach out.

I will likely want to flat tow a Jeep Wrangler TJ (3,500 lb) at some point so I'm thinking 3.70 gears might be in our future.

uprooted wrote on Wed, 11 March 2020 01:25

Jim- to be honest we haven't even had this thing on the highway yet. I want to get a 3.07 FD back in there to see what we are working with before making the decision on what gears to go with and spending the $$. At that point I would likely reach out.

I will likely want to flat tow a Jeep Wrangler TJ (3,500 lb) at some point so I'm thinking 3.70 gears might be in our future.

Corey,

While I like your plan to get it right and then change things, I can tell you right now that the 3.07 put in there at the factory was wrong then.

Doing what you are doing is a good plan, it will only cost a set of drive axle screws and a gasket to find out what it should be like. Many people have towed with the 3.07FD, but I bet you would like the 3.70 more. The experience can't hurt.

Matt

Not to go down another rabbit hole, but in my infinite wisdom, new drive axle screws were installed just 2 weeks ago after replacing cv boots. Torqued to 65 left, loctite etc. Since then the coach has driven about one mile. Do these bolts need replaced again? Do they stretch when you tighten them for the 1st time?