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Posted: Fri Feb 17, 2012 11:03 am    Post subject: For all those who would rather beef up the HZJ105 series R151F gearbox than replace it, here is a list of parts required to replace the partially splined 3rd / 4th Clutch hub with the modified fully splined clutch hub that is currently available for the 78/79 series R151F gearbox. 1 x Modified Clutch Hub 33362-35030M 3 x Shift Keys 33366-35030 2 x Shift Key Springs 33391-25030 1 x Clutch Hub Sleeve 33364-35050 1 x 3rd Gear Synchro 33368-35020 1 x 4th Gear Synchro 33368-3

For all those who would rather beef up the HZJ105 series R151F gearbox than replace it, here is a list of parts required to replace the partially splined 3rd / 4th Clutch hub with the modified fully splined clutch hub that is currently available for the 78/79 series R151F gearbox. 1 x Modified Clutch Hub 33362-35030M 3 x Shift Keys 33366-35030 2 x Shift Key Springs 33391-25030 1 x Clutch Hub Sleeve 33364-35050 1 x 3rd Gear Synchro 33368-35020 1 x 4th Gear Synchro 33368-35040 1 x 3rd Gear 33034-60030 (ouch - yes this must be replaced however, the input shaft and output shaft don't need replacing) All available from Don Kyatt or Driveline with a total retail cost around $770 inc GST. Now for the interesting part, Don Kyatt's Melbourne head office said that plans were underway to manufacture a fully splined version of the 100 series clutch hub but it won't be available for at least a year. Other items available to beef up the gearbox are the hardened 1st and 5th gear thrust washers, the metal cylindrical spacer and the fully splined 5th gear. I was also informed that it may be prudent to replace the retaining plate securing the output shaft bearing - 333151-35020 ($52 inc).

Ive just fitted a Exedy Safari tuff clutch to our cruiser, awsome clutch and no shudder.Ive never heard any bad reports about one. Cost for clutch was around $750.Not sure on fitting costs as I fitted it myself.

What ever you go for just make sure it's a heavy duty one

4terrain heavy duty clutch, the clutch itself cost $800, $75 for a flywheel machine, $55 for a new spigot and around $400 for labour, all up around $1300. Its plenty of cash but like you said once its done, it wont need to be done for many k's and you wont have it in the back of your mind.

Late model 1HZ powered cruisers ( wagons, utes and troopies) are fitted with an R151 gearbox as opposed to factory TD and petrols that are fitted with H150. H150 boxes are substantionaly stronger than R151. How long an R151 lasts behind an aftermarket turboed 1HZ depends on how it is driven I would think. Other than a mismatched or poorly installed/tuned turbo the R151 is the weakest link. While there are plenty of sucessful 1HZ turbo installs out there, there are also ugly ones. Be careful.