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Diff Pinion Spline Wear - Input Requested
Posted by: flat_six ()
Date: March 19, 2020 05:05PM

Looking for experienced opinions. Run it or replace? Thx, Mike




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Re: Diff Pinion Spline Wear - Input Requested
Posted by: 2ragtops ()
Date: March 19, 2020 05:16PM

Mike I would get a different one

Bob Bauer

Show-Me Corvairs

1966 Monza Convert 140 P/G with A/C, plastic wheel with tele-column am-fm posi-traction
1966 Corsa Convert 180 wood wheel tele-column am-fm sport steering posi-traction
1965 Corsa Coupe Crown V8 temporarily red lined for repair
House Springs, Missouri

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Re: Diff Pinion Spline Wear - Input Requested
Posted by: steve c goodman ()
Date: March 19, 2020 05:27PM

Pretty marginal. My opinion only of course.

Short side note: if some grease is used on trans splines I think that grease slows the wear of the splines inside pinion shaft.

best wishes, Steve
Rear Engine Spec. Inc. Golden, Colo.

1962 spyder 3.0L turbo---1965 Crown V8
1967 monza 110/4---1968 monza 110/4
1971 amante gt 110/4
CORSA/RMC/PPCC/V8 Registry



Edited 1 time(s). Last edit at 03/19/2020 05:31PM by steve c goodman.

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Re: Diff Pinion Spline Wear - Input Requested
Posted by: Timothy Shortle ()
Date: March 19, 2020 06:46PM

Looks to me like about 1/3 of the way worn. How do you drive your car? If driven lightly this should be fine.
Of course I know you have high performance Corvairs. Is this for your 140 or your 180? If driven mildly it should
be OK. My opinion of course.

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Re: Diff Pinion Spline Wear - Input Requested
Posted by: 66vairman ()
Date: March 19, 2020 07:47PM

steve c goodman Wrote:
-------------------------------------------------------
> Pretty marginal. My opinion only of course.
>
> Short side note: if some grease is used on trans splines I think that grease slows the wear of the splines inside pinion shaft.

Agree Steve. I use a moly grease.

I've seen worse splines, but considering the labor to replace it later you might as well put in a better one now.

Maybe I missed it, but what year is your transaxle? As discussed here - you CANNOT use a model year 1965 or earlier pinion shaft in a 1966 model year or later.

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Re: Diff Pinion Spline Wear - Input Requested
Posted by: flat_six ()
Date: March 19, 2020 08:02PM

This is a 1966 AD (3.55:1 posi) diff coupled to a 4 speed. Engine is 180 turbo.

Anyone out there have a really good used one to sell?

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Re: Diff Pinion Spline Wear - Input Requested
Posted by: flat_six ()
Date: March 19, 2020 08:03PM

steve c goodman Wrote:
-------------------------------------------------------
> Pretty marginal. My opinion only of course.
>
> Short side note: if some grease is used on trans splines I think that grease slows the wear of the splines inside pinion shaft.


Steve, does the grease actually stay in place?

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Re: Diff Pinion Spline Wear - Input Requested
Posted by: REM654DPG ()
Date: March 19, 2020 09:04PM

Mike, I would agree with the general consensus here that you should replace it too. Mostly because you have it all apart and there are better ones to be found.

If you can find even a good 65 style they can be easily modified or shortened to fit the 66 & later application.

Also don't forget to have your side and spider gears wet magnafluxed before re-using them. You might just be surprised.

And if you're interested in a honed set-up pinion bearing (new Timken) I have them available for $20.00 plus the USPS priority ride.

Regan Metcalf
Portland, OR

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Re: Diff Pinion Spline Wear - Input Requested
Posted by: vairmech ()
Date: March 20, 2020 05:15AM

flat_six Wrote:
-------------------------------------------------------
> This is a 1966 AD (3.55:1 posi) diff coupled to a 4 speed. Engine is 180 turbo.
>
> Anyone out there have a really good used one to sell?
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

How many do you want?

I modify all of my pinion shafts to include a 1/8" hole so lube can get in there and actually exchange. The hole goes just in front of the splines that area is a non-stressed area so it hurts nothing and you gain lubrication.

I have found that grease does not really stay in place and actually keeps the contaminate in place, I used to do this also.

BTW the consensus is correct on the usage, I would still use that for a daily driver without reservation. If the car was pushed at all then it is time to rethink, any 140/150/180. Even then how many miles are you going to put on the car?

There is no real cut and dried "is it good-is it bad" but with that said I do draw the line at 50% wear for even the lightest use.

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

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Re: Diff Pinion Spline Wear - Input Requested
Posted by: steve c goodman ()
Date: March 20, 2020 05:34AM

flat_six Wrote:
-------------------------------------------------------
> steve c goodman Wrote:
> -------------------------------------------------------
> > Pretty marginal. My opinion only of course.
> >
> > Short side note: if some grease is used on trans splines I think that grease slows the wear of the splines inside pinion shaft.
>
>
> Steve, does the grease actually stay in place?

Steve sez: NOPE the grease gets washed away by the gear lube but in my mind it is better than starting out with metal to metal contact when putting trans and diff together.

best wishes, Steve
Rear Engine Spec. Inc. Golden, Colo.

1962 spyder 3.0L turbo---1965 Crown V8
1967 monza 110/4---1968 monza 110/4
1971 amante gt 110/4
CORSA/RMC/PPCC/V8 Registry

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Re: Diff Pinion Spline Wear - Input Requested
Posted by: vairmech ()
Date: March 20, 2020 11:03AM

I thought I had done this before but here are some pictures for your enjoyment of various pinion shafts. I will put a little explanation above each one.

This picture has only about 10% wear and fully usable.



This picture is right at the 50% mark and is actually in my scrap pile.



I would put this one at the 60% worn mark. Yes I have cut the shaft in two for demonstration purposes and I keep that around to show people.



Here is close to 70% worn.










And then we have,"it drove into the shop"!









Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

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Re: Diff Pinion Spline Wear - Input Requested
Posted by: flat_six ()
Date: March 20, 2020 11:05AM

vairmech Wrote:
-------------------------------------------------------
> I thought I had done this before but here are some pictures for your enjoyment of various pinion shafts. I will put a little explanation above each one.
>
> This picture has only about 10% wear and fully usable.
>
> And then we have,"it drove into the shop"!
>
>
>
>
>
>
>

Yikes!!



Edited 1 time(s). Last edit at 03/20/2020 11:09AM by flat_six.

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Re: Diff Pinion Spline Wear - Input Requested
Posted by: 66vairman ()
Date: March 20, 2020 11:08AM

flat-six - PM sent

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Re: Diff Pinion Spline Wear - Input Requested
Posted by: Wagon Master ()
Date: March 20, 2020 11:11AM

Ken, I see no pictures of a pinion shaft with your 1/8" lube hole.

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Re: Diff Pinion Spline Wear - Input Requested
Posted by: flat_six ()
Date: March 20, 2020 11:19AM

Clark's has a new pinion shaft listed for 65-69, yet it has been pointed out that the 66-69 is shorter. C6027L

Anyone have experience with this shaft in the 66-69 application?

I'll send them a message and ask.

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Re: Diff Pinion Spline Wear - Input Requested
Posted by: nirvairna ()
Date: March 20, 2020 02:11PM

great pictures Ken, thanks for posting them

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Re: Diff Pinion Spline Wear - Input Requested
Posted by: vairmech ()
Date: March 20, 2020 07:18PM

Wagon Master Wrote:
-------------------------------------------------------
> Ken, I see no pictures of a pinion shaft with your 1/8" lube hole.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

Sorry I didn't have any available, I suppose I could have drilled one.

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

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Re: Diff Pinion Spline Wear - Input Requested
Posted by: REM654DPG ()
Date: March 20, 2020 09:10PM

Ken, the lube hole is a great idea and I never even thought about that - thanks for sharing. And great pictures too - those shafts have definitely seen better days.

Regan Metcalf
Portland, OR

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Re: Diff Pinion Spline Wear - Input Requested
Posted by: v8vair ()
Date: March 21, 2020 07:24AM

Ive had people ask me if they should run the transaxle a little low so less chance of leaking out the throw out bearing collar. NO Make sure the transaxle is
FULL !

1965 Crown V8 Racer
1964 Bill Thomas Monza Replica Racer
1964 Spyder Street Car
1979 Mazda RX7

Mike Levine

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Re: Diff Pinion Spline Wear - Input Requested
Posted by: flat_six ()
Date: March 21, 2020 08:14AM

Looks like I will seek a better shaft. Thank you all for the inputs!

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