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G260 Transmission Rebuild Break-in Procedure

G260 Transmission Rebuild Break-in Procedure

Street

Partial break in is done on the rebuild bench. For street transmissions we recommend 500-1000 miles of street driving and a fluid change.  It can be normal for the drain plugs to be covered in quite a bit of silver sludge after the first few fluid changes.  As long as there are no chunks, it is a normal part of the break-in procedure. 

Track

Partial break in is done on the rebuild bench.  At the track, do a session shifting at 5/10ths then next session 6/10ths and next 7/10ths and so on.  After the first 10/10ths session, do a fluid change and you’re good to go. It can be normal for the drain plugs to be covered in quite a bit of silver sludge after the first few fluid changes.

Rebuild Procedure

Each G260 transmission is fully disassembled, cleaned, and inspected. Each gear, bearing and synchro is inspected for wear. All worn items are replaced. All seals are replaced. Transmissions are bench dynoed for partial break-in and performance verification. We do not do any modifications that would disqualify from spec e30.  The machining we do is mainly reshaping smashed engagement teeth to clean them up to where they are like new.  We also take off any high spots on gears and clean up any oil evacuation flaws on the tooth patterns.  This is all proper standard procedure remanufacture techniques. Purchase here.

Recommend Fluid
Motulgear 300 75w90 non LS or Motorcraft Synthetic Manual Transmission Fluid. Buy from a reputable seller, we have found counterfeit Motul on Amazon.
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