Diff Info

[hotrod]

anyway the article explians that autos suck more power than manuals.. but how does that effect your engine revs at 100 clicks?

means more power required to drive auto,   more power = more revs

[westy12]

gday mezzmo i run a 3.08 banjo diff in mine with a 202 and trimatic. it takes off fine and cruises at 100 at around 2600-2700. i read on here u can put a hq-hz ute diff in but youll have to change the diff and shock mounts... not too big a job. take it easy... luke

[JOE RYAN]

Running 14inch tyres with an overall diameter of 63 cm approx

[ben]

im no expert dont get me wrong but if the auto is doing more revs at 100 than the manual then wouldnt that mean the clutch is slipping?

[JOE RYAN]

there is  no external clutch with auto gear box only internal clutch bands inside auto gear box, my gear box is a new rebuild, there is always a revs differential between manual and auto boxs unless you get a lockable torque converter

[ben]

doesnt make sense to me and it didnt change my revs in my van between the 4 speed aussie box i had in and the trimatic i put in about 4 months ago. quite possible your speedo drive gear on your trimatic is different to the one on the 3 speed. so your speed is actually different therefore changing the revs.

ben

[restoreid]

Hi Joe my campa has 202 trimatic 3.7 diff 195 tyres on standard 14 inch rims & the tyres have an overall diameter of 650 cm & is reving its ring out at 100 ks will test it out when I get it back on the road Cheers Reid

[able]

how well will a 186 go with a m21 and a 3.5:1 diff?

 

[ben]

yeh will be reving a bit able but not too much.. maybe 3grand at 100 or something around that.. put a celica box behind yours with the overdrive and it would be perfect!! not worth that much.. i picked up a conversion kit and box for $150

ben

[Jock]

doesnt make sense to me and it didnt change my revs in my van between the 4 speed aussie box i had in and the trimatic i put in about 4 months ago.

The final drive gear ratios for the trimatic and the m21 4 speed are exactly the same.
Revs in top gear with a Trimatic fitted will be the same as the revs in top gear with an m21 4 speed box fitted.

Another way of saying this would be that the gear ratio of 3rd gear in a trimatic gearbox is the same as the
gear ratio of 4th gear in a m21 4 speed gearbox.

Jock