Gday All, tossing up whether to put a 5 Speed Toyota Supra box behind my 308 or keep it original and stick with the M21. Just wondering if anyone has had any good or bad experiences with this combo. Would like to keep it original but the M21 tend to break easier than the Tojo boxes. Cheers.
great post, im joining in as im also after this kind of feedback too.
I've got a slightly worked 5l and the aussie 4 speed box (M21) just doesnt cut it, especially on the highway. (running 3.08 rears)
i found the following page useful for ratios in the different toyo boxes:
http://holdenpaedia.oldholden.com/To...ed_gear_ratios
my understanding is that a 'supra' 5 speed could be any of the 'w' series toyota boxes. all in all ya do get an overdrive gear, but the first gear in the toyo boxes would be ridiculous for a v8 from what i can see.
cheers all
Ski man
Your other options are to rebuild the M21 as an M20 or M22 in combination with a 2.78 or 2.6 diff change. It does the same thing as fitting a 5spd (ie ratio spread) but has 4 gears instead of 5. It will probably be cheaper and leaves your van 100% original (bar the gears in the box and diff). The M22 ends up with a 1st just like 1st in the Supra box, and 4th ends up where 5th is (ratio wise). The M20 gives you a 1st just like you have with an M21 and a 3.08 diff, but 4th ends up as per a Supra in 5th with a 3.08 diff.
Have a supra 5 speed in ours, which I was going to change back to an M20 but after spending time driving it with the 5 speed no way. It is great to drive. Very smooth changes and great to have 5th gear for hiway driving to keep the revs down.
for the non anal/non correct restorer i would say go to the supra box..they will take more abuse than any of the aussie 4 speed boxes and are cheaper to buy as a box alone after you have done the conversion..just not on initial outlay..:geegee:
Last edited by ozbox; 15-09-2010 at 08:20 PM.
Was thinking about this:
http://cgi.ebay.com.au/HQ-WB-VB-VL-5...item4cf18cc5da
Has anyone recently done this conversion? I have just finished rebuilding my 308 and I have a 3.08 10 bolt diff. I picked up a supra 5 speed none of it has gone in yet? I was wondering if anyone knows how much/where to get a tailshaft to suit? im located in QLD
Cheers any further info or help would be great!
G'Day Jack,Originally Posted by JackHopkins
I did this conversion this year into my 77 308 Pano. It had the M21 and the std diff, 3.37 something I think. There are a couple of Supra boxes, ,make sure you get the one with the steel 'sandwich plate' in there, the totally alloy ones are supposed to be weaker.
You will need a bellhousing and a crossmember (or modify your own). Depending on the type of clutch you have you may need a new cable and brake pedal. You also need a clutch and throwout bearing to suit the Toyota shaft and a new spigot bearing. All this stuff you can get from Dellow or Castlemaine Rod shop or Kingswood Country. Keep an eye out on ebay and Gumtree too, I was able to get most of it there. You will need to shorten and balance the drive shaft with the Tojo yoke on it. If you have the Box then the big cost is the bellhousing 6-800. Clutch about 400, cross member 2-300, pedal -100, drivesshaft 400.
Good news is it works well, you get a quicker take-off plus lower revs at cruise. It drops the revs about 400 at 110.
any driveline/engineering shop will make one if you take them the yoke to suit supra. 3.08 will be an OK ratio. wouldn't want to go any taller. i had a 2.78 and it was rubbish until you got to 5th on the highway. 3.55 was too lively. I reckon 3.36 would be perfect. I don't know if mine was W57 W58 or other Supra mind you. they have different gear ratios. you'll need a modified cross member, a bell housing and a speedo drive i think.
BQZ
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