Second gear grinding & remedy

ChrisJ

ChrisJ

Active member
Right now my trans doesn't have any shifting problems luckily and hopefully it will stay that way.

However, I noticed a few comments suggesting thicker oil will either help or stop grinding. I'm curious how or why thicker oil would help synchronizers work better? If anything I would expect it to make it more difficult to speed up gears and also cause the synchronizers to slip more. I know in my past experiences thicker oil ALWAYS made shifting more difficult especially in cold weather. Keep in mind, in these transmissions you are not technically grinding gears, you are grinding the dogs on the sides of the gears which lock into collars to couple them to the shafts. The actual gears never disengage from each other.



Now I'm not saying anyone is wrong, there are many who know far more about transmissions than me. I'm just curious why a higher viscosity oil would help a grinding problem in this transmission?
 
$ub$onic

$ub$onic

The Sticker Guy
By ur theory any oil would cause them to slip. Thicker oill has more resistance

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ChrisJ

ChrisJ

Active member
$ub$onic said:
By ur theory any oil would cause them to slip. Thicker oill has more resistance

Sent from my SAMSUNG-SGH-I747 using Tapatalk 2
Click to expand...


$ub$onic, with all due respect, do you understand how a synchronized transmission works? Because the cone clutches are designed to slip and yes oil increases the slippage but this is bad.


Like I said I know the basic concept behind it and what I remember happening in the past with thicker oil (more grinding) but like I said I am by no means an expert and am completely opinion to opinions. I just wanted to know other technical thoughts behind why thicker oil would help this issue.
 
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$ub$onic

$ub$onic

The Sticker Guy
Apparently I know something Cuz the one thing ur fighting every one is doing and having good results . Yes a thicker oil in winter will grind. That's y I haven't done it . But a thicker oil to a degree will help

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ChrisJ

ChrisJ

Active member
Eric.Smit said:
people are swapping oil even though there is a TSB documenting the "real" fix.


-Eric Smit
Click to expand...


People very often hope a different oil will work miracles ergo why I have my doubts.

I have never seen a magical fix in a bottle for anything.


Also $ub$onic, I didn't realize asking some general questions was classified as "fighting".
 
$ub$onic

$ub$onic

The Sticker Guy
I apologize I did not mean to come off like that. Its been a rough day.....

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ChrisJ

ChrisJ

Active member
SuperFudd said:
Here is an explanation of why thicker works.

2012 Chevrolet Sonic Grinds Shifing From 1st To 2nd | CarComplaints.com
Click to expand...


He made a good point, the heavier oil would slow the input shaft faster. I guess if I ever do end up with the problem I'll know what to do. However in 2000 miles I've yet to see a hint of a grind. Luckily..

I will admit I do baby the transmission, when I shift I push the shifter towards the gear with little pressure until the syncro grabs, then it slides the rest of the way effortlessly. Sure, its a much slower shift but its really easy on things.
 
ThatTmoGuy

ThatTmoGuy

New member
Sometimes i feel like i could break the shifter off, i mean it's plastic so it could happen. Hopefully a new after market option will be available soon :)
 
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