Technical Tips > Transmissions - Differentials

Dif drain & speedo gears

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sirfixalot:
How is the LSD oil drained from the diff?
Have just put turbo 700 auto in my car diff is 3.55 ratio with  265  x 15 " tyres any one have any info on what  speedo gears will suit
to get correct speedo reading

Cameron 77C3:
Don't know about other vettes but on a 77 there is no diff drain.  You have to remove the old oil through the filler hole with a plunger.

There is a thread on speedo gears here somewhere.  I'll go find it for ya and report back shortly

Cam

Cameron 77C3:
Ok I found this

hi cam the formula is
63360 X axle ratio
-----------------------[divided by]
3141.6 X tyre diameter in inches
the figure you get for that is then times by 8. This gives ya the number of teeth needed on the speedo driven gear.


And this was in this thread, CLICK ME

Hope this helps

Cam

Chromie:
Hi sirfixalot ;42
It is recomended that you remove your differential. then remove the cover flush out all the old oil.
Install a suitable drain plug and reassemble
make sure that you use correct differential oil ;27

77CVT:
TH700 with 3.55 gears!!!   Man that will have some hook off the line!!

;46;46

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