Opinions

mfleury · Poncho Master!

Opinions

ARCADIAN · Poncho Master!

Marty I changed from 3:08 to 3:73 gears and had to change the speedometer gear to a new 22 tooth as my speedometer was reading @60 mph but only actually doing 45 mph. GM Dealer has speedo gears and mine cost with tax $14.50. Check to see what # tooth /colour your original is then there is a formula on the internet based on tire size and gear ratio to give you a suggestion on which # tooth gear you need. Hope this is what you need to know.
arcadian

4SPEED427 · A Poncho Legend!

Yes, what Arcadian says^^^^

Pull out your driven gear, take a peek into the trans and figure out how many teeth on your drive gear and we can likely get your speedometer to be very close to correct.

10 bolt diff, right? Likely the gears that went in are 3.36 ratio.

mfleury · Poncho Master!

When the guy changed the rear gears he told me it was from a 66 Pontiac and gears are 3.39 that he put in I got it written down in my manuals I,lol check them thanks guys

mfleury · Poncho Master!

Chris and carl went and took the gears out on side of tranny I said 3.39 but I don,t think there's such a gears.

i believe what carl said 3.38

the gear I took out is red and has 21 teeth I will send a picture would you have he site web page for that chris chart thanks guys

-- Edited by mfleury on Saturday 13th of June 2020 12:29:11 PM

66 327 sd · Guru

Unless Ive got it backwards, this might be a good excuse to get a spare set of shoes and tires with a larger diameter!

mfleury · Poncho Master!

Just ordered my speedometer gears for my tranny and also got the bullet to go with it.

i got 18,19,20,21,22

if anybody needs one 12.00 plus shipping will do the job thanks guys

dualquadpete · Canadian Poncho Superstar!

you may have to change the drive gear on "out put" shaft as well, which requires taking the tail shaft housing off transmission. It;s held on shaft with a clip. other alternative is to put a adapter on where cable hooks to transmission to reduce or increase gear drive!!!

4SPEED427 · A Poncho Legend!

mfleury wrote:
I got a ? for any body that wants to answer it Finally went fir a drive in my convertible on wed. I used speed veil from my cell ph to compare the mileage on my car. Worked it out I,m about 15 mikes slower than my app from speed view. I changed rear end gears from 308 to 339 would that cause that much diffrents in my speed I know 4 speed 427 can answer this ?

Are you saying that when your actual speed is 60 mph your speedometer indicates 45 mph?

koolconvertible · Poncho Master!

I removed my useless, unfixable clock and installed a GPS speedometer. between changing tyres, wheels, diff gears. was a good move. I really like it.

mfleury · Poncho Master!

If I gotta change drive gear then it's going to stay the way it is