My 69 has the TKO600 2.87 1st gear and I'm running 3.08's in the rear and I want a little more pull off the line, maybe 3.55's or 3.70's.
68 rear end gears
Thread Starter
Melting Slicks
Joined: Mar 2005
Posts: 2,187
Likes: 7
From: Chetwynd B.C.
68 rear end gears
Thinking about changing the rear end gears instead of the TKO tranny. (maybe later for the tranny) What gears will fit in the '68? I'm running 3.70's right now and thinking of going to at least 3.08's or even higher if possible. Also is there anything else I need besides the gears? Maybe rebuild the posi?
shmoky
shmoky
Last edited by shmoky; Nov 16, 2009 at 11:19 PM.
Instructor
Joined: Jan 2007
Posts: 227
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From: Dallas Texas
Thinking about changing the rear end gears instead of the TKO tranny. (maybe later for the tranny) What gears will fit in the '68? I'm running 3.70's right now and thinking of going to at least 3.08's or even higher if possible. Also is there anything else I need besides the gears? Maybe rebuild the posi?
shmoky
shmoky
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Thread Starter
Melting Slicks
Joined: Mar 2005
Posts: 2,187
Likes: 7
From: Chetwynd B.C.
I hate to say it but your 1st gear of 2.20 is going to be a dog with 3.08s in there. You can probably do 70 mph in 1st gear though. I don't care how much torque you have. Your 1st gear of 6.77 is going to be rough. Take what you have now M21 and 3.70 and strat driving around without using 1st gear. Start off in 2nd gear and that is about the same multiplication and 3.08s and 2.2 1st gear.
You're correct that the multiplication in 2nd gear is close (6.78 vs 6.07). I never thought of looking at it in that manner. I have driven my car starting out in 2nd gear. As long as I am NOT in a hurry it is not a problem at all. Have actually done it unintentionally. BUT, if I want to launch it
it wants to burn the clutch very bad. If that's what 3.08's are going to do then they are NOT what I want. If I go to the 3.36 then my cruising rpm will still be up around 2800rpm and that it not good enuf of a gain to change out the gears. The 3.55 of course would be even worse.
So it's back to the OD tranny and saving more of those elusive $$$. I've been off work for 6 months so it won't happen this winter. Just have to put up with it for another year and plan (and save) for it next winter.
Thanx EVERYONE for your help.
shmoky
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
THANX GORDONM
You're correct that the multiplication in 2nd gear is close (6.78 vs 6.07). I never thought of looking at it in that manner. I have driven my car starting out in 2nd gear. As long as I am NOT in a hurry it is not a problem at all. Have actually done it unintentionally. BUT, if I want to launch it it wants to burn the clutch very bad. If that's what 3.08's are going to do then they are NOT what I want.
If I go to the 3.36 then my cruising rpm will still be up around 2800rpm and that it not good enuf of a gain to change out the gears. The 3.55 of course would be even worse.
So it's back to the OD tranny and saving more of those elusive $$$. I've been off work for 6 months so it won't happen this winter. Just have to put up with it for another year and plan (and save) for it next winter.
Thanx EVERYONE for your help.
shmoky
You're correct that the multiplication in 2nd gear is close (6.78 vs 6.07). I never thought of looking at it in that manner. I have driven my car starting out in 2nd gear. As long as I am NOT in a hurry it is not a problem at all. Have actually done it unintentionally. BUT, if I want to launch it
it wants to burn the clutch very bad. If that's what 3.08's are going to do then they are NOT what I want. If I go to the 3.36 then my cruising rpm will still be up around 2800rpm and that it not good enuf of a gain to change out the gears. The 3.55 of course would be even worse.
So it's back to the OD tranny and saving more of those elusive $$$. I've been off work for 6 months so it won't happen this winter. Just have to put up with it for another year and plan (and save) for it next winter.
Thanx EVERYONE for your help.
shmoky
Clutch life would be severly shortened also as you would have to slip the clutch a lot more to get moving. With my setup I can almost let the clutch out with no throttle. Mine is a little on the other side of thechart for 1st gear but I like it.
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