Mk1 Mr2 6 speed gearbox with or without LSD
Is your 5 speed gearbox giving trouble? Jumping out of gear or becoming whiney or notchy? Or are you just looking for a nice modern upgrade for your Mk1 Mr2 by giving it a fresh 6 speed gearbox?
We are happy to be able to offer a 6 speed upgrade for the Mk1, the gearbox can be supplied in either LSD form or with the standard open diff. If you choose the stock diff your Mk1 driveshafts can be used as normal, if you choose the LSD version you will need to use Mk2 Mr2 NA driveshafts, but these are fully plug and play with the Mk1.
This gearbox upgrade will fit as a direct replacement for your stock 5 speed gearbox, there will be nothing to modify or change, just fit the new gearbox and you will instantly have 6 speeds.
This gearbox upgrade gives you much better ratios throughout the rev range and a much lower cruising RPM in 6th gear, it also increases the vehicle top end speed by 11%.
There is a fuel saving to be made as a result of the lower cruising RPM.
What you get.
I use a Celica Gen7 6 speed C60 trans, strip it right down, and refit the gears into a Mk1b C52 bellhousing (gives you two starter motor locations for use with either 16v or 20v swaps)
All gear cases are high pressure steam cleaned, new diff side bearings fitted to either your choice of stock C52 open diff or Mk3 Mr2 LSD unit. The diff preload is checked and adjusted methodically and reshimmed to the top end of Toyota spec.
I recommend the newer and stronger C60 diff is used if not going down the LSD route, this gives you the ability to use the Mk2 Mr2 NA driveshafts which are much stronger and better designed than the Mk1 type.
The gears are all inspected, and new Toyota input shaft and output shaft bearings are installed.
The input shaft oil seal and both diff output oil seals are renewed.
The whole trans is sealed and painted in whatever colour you like.
So you end up with a bearing and seal overhauled 6 speed trans that will bolt straight onto your 4a-ge engine without any modification whatsoever, your speedo cable will plug straight in, reverse light will plug in, axles will work as normal with the Mk1 stock diff, all mountings will be OEM and the shifter assembly and slave cylinder will all just bolt up without any modification, truely plug and play. It will be a simple transmission swap no different than fitting another 5 speed. If you chose to have the C60 open diff or LSD diff you will only require Mk2 Mr2 NA axles/shafts which are totally plug and play into Mk1 hubs.
The 6 speed trans will then be carefully packed and shipped to your door within 2 weeks of ordering. (in most cases under 10 days from ordering)
The gear ratios will be as follows...
1st gear 3.166
2nd gear 2.050
3rd gear 1.481
4th gear 1.166
5th gear 0.916
6th gear 0.725
Final drive 4.529
The optional LSD unit
A 6 speed during rebuild.
This 6 speed conversion has been shipped and used all over the world and bolted to some very high HP 4a-ge engines in NA and boosted form, some in excess of 260bhp without a single issue.
Checking out at £1250 does not include the LSD upgrade or Mk2 Mr2 axle upgrade or shipping cost, please email me to discuss all options and additional extras, The LSD option is an additional £400 but please email me for availability, thank you.