Topic: Transmission questions why do the 3rd gear always brake first

[Bazzi]

Why do the 3rd gear always brake first
It is werry poppular here in Iceland to mix the original 2,4 diesel engine with a 2,8 strip block.
But it seams like when this is done the 3rd gear always brakes in the transmission. It seams to happen during or after a hard race (the 3rd gear has a great tourqe and is werry often used during climbing up glaciers). 
I know of 3 g54 transmissions that have failed like this and one w56 transm.

The question is : Why does the 3rd brake and how can we build it stronger. Or what transm. is strongest from those hilux/4runner/land cruisers that can be bolted to a 2,4 diesel (same as the 2,4 efi)

[awhotrods]

turbo tranny w/ cryoed gears

[Bazzi [OP]]

turbo tranny w/ cryoed gears

where can I find those gears??

[Marlin]

To obtain the third gear ratio, the mainshaft gear must be smaller in size than first or second so by design it would be weaker.
The most common cause of failure is a worn main shaft retainer plate.
A worn plate will allow the mainshaft to walk sideways and allow the 3rd gears to run out of line.
Also worn bearings and wrong c-clips will also cause problems.

W56, and R transmissions would be stronger.

[Bazzi [OP]]

Thanks for the hints, and the quick answears
Just to make sure the main shaft retainer plate is the plate around the main shaft in this pic.?

http://www.marlincrawler.com/images/w56c_front_500.jpg

Regards Bæring

[Marlin]

No, that is the front bearing retainer plate.
The plate that wears is in the middle of the trans and bolts to the center cast iron plate.