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Small Crunch From 3rd To 4th

nsta
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nsta Mentor

nsta

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Hey guys i recenetly done an auto to manual conversion in an r33 with a box that had done 51000kms(rb25det), problem is when shifting from 3rd to fourth in high rev range, theres a slight crunch, and no its not my driving hahaha. Are my synchros gone?and should i take it easy cause its doing that?

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PT

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Posted

yeah 3rd to 4th seems weakest synchro in the RB25 (well it appears that way from the last 2 RB25 boxes I've had)

yes you should take it easy, shift slower so your actually rev matching or even though it can be a pain clutch IN shift to neutral clutch OUT then clutch IN again and select 4th this was all I could do on my old box as the synchro was totally rooted, don't keep grinding or forcing it in you'll just wear your box out quicker. If the other gears are good and no bad bearing noises I'd just put up with it, the synchro's themselves aren't expensive it's the labour to pull the box off car/pull box apart etc that costs the most

nsta Mentor

nsta

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cheers mate, whats the life expectancy of a fully rebuilt manual transmission?ikm just thinking of doing this once my box starts to get old, it works out cheaper in the end, and at least that way you know youve got a new box recon. and not taking the risk buying another 2nd hand one that may be rooted!

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