I've got my six speed trans apart to do the NSX-R 4.2 Final drive & diff upgrade.
I've fitted the new spring & Spacer to the 5 speed diff & breakaway torque is in spec & I fitted new bearings to the diff.
Before I fully disassembled the trans I left the original 6 speed diff in to check the existing preload on the 6 speed diff bearings just to make sure my new dial torque wrench was working ok & had 15 Inch pounds which was a bit on the low side of spec. original bearing shim is 2.12mm
Since fitting the 5 speed diff I can't seem to get any preload. I'm up to 2.5mm shim thickness(I machined) with no preload yet.
I'm now past the thickest shim Honda makes (the autos have thicker shims listed) but i'm past that now.
Can any experts shed any light on this? The manual says not to double up on shims.
I've put the six speed diff back in to recheck and it has preload.
I've fitted the new spring & Spacer to the 5 speed diff & breakaway torque is in spec & I fitted new bearings to the diff.
Before I fully disassembled the trans I left the original 6 speed diff in to check the existing preload on the 6 speed diff bearings just to make sure my new dial torque wrench was working ok & had 15 Inch pounds which was a bit on the low side of spec. original bearing shim is 2.12mm
Since fitting the 5 speed diff I can't seem to get any preload. I'm up to 2.5mm shim thickness(I machined) with no preload yet.
I'm now past the thickest shim Honda makes (the autos have thicker shims listed) but i'm past that now.
Can any experts shed any light on this? The manual says not to double up on shims.
I've put the six speed diff back in to recheck and it has preload.
Last edited: