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Old 06-26-2003, 01:10   #1 (permalink)
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Cost v Benefits of diff change compared to manual conversion in v8 NC

Hey all,

I was wondering what your views are on costs and benefits (well mainly benfits) of either

1. Changing diff gears to 3.7s or 3.9s

or

2. Manual conversion.

Car is a v8 NC fairlane.

Some problems i think could be a problem with the manual conversion would prob be tailshaft length due to LWB, and ofcourse finding a V8 box...

To be honest I reckon the diff gears would give me manual like performance, and probably be a bit cheaper; Down side, would rev maybe a bit too hard on the highway (currently have 3.27 LSD and revs around 1900ish @ 100kph) plus I dont have the control I would wit the stick shift....

What do you think?

hot_eb
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Old 06-26-2003, 02:18   #2 (permalink)
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once rolling say past 40-50 kays, the two might be similar, but u could never match the 3000rpm clutch dump and squat on take off the manual will perform.
hmmmm, V8, 3.9's and a manual hehe fun
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Old 06-26-2003, 02:41   #3 (permalink)
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Re: Cost v Benefits of diff change compared to manual conversion in v8 NC

You use the same tailshaft for auto or manual. V8 Boxes are easy to find.
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Old 06-26-2003, 03:11   #4 (permalink)
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Re: Cost v Benefits of diff change compared to manual conversion in v8 NC

Quote:
Originally Posted by WBT56
You use the same tailshaft for auto or manual. V8 Boxes are easy to find.
you got one for me then!?!!? How hard are the v8 conversions compared to 6 cyl?? You deal a lot with diffs dont you (judging by your other posts anyway) what would you recommend?

Quote:
Originally Posted by qwikcorty
once rolling say past 40-50 kays, the two might be similar, but u could never match the 3000rpm clutch dump and squat on take off the manual will perform.
hmmmm, V8, 3.9's and a manual hehe fun.
3.9s and manual would be the way to go, but unfortunately the bling bling dont allow it! A 3000rpm clutch dump though and i will spin my sorry arse half way to redline...I dragged a supercharged commy and the 3000rpm lost me the race in my old 6 pot eb! 2200rpm had us dead even to a few kms over 100....
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Old 06-26-2003, 03:28   #5 (permalink)
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Re: Cost v Benefits of diff change compared to manual conversion in v8 NC

Quote:
Originally Posted by hot_eb
you got one for me then!?!!? How hard are the v8 conversions compared to 6 cyl?? You deal a lot with diffs dont you (judging by your other posts anyway) what would you recommend?
I have one, PM me if you are serious. V8 are no harder than I6 to convert, just an extra pipe to dodge. Most windsor/T5 combinations perform outstanding with 3.45, and don't perform better by going lower without mods to help it spin up quicker. I have no experience with autos in this department and won't comment.
Surprising as it may sound, you should be less likely to light up the rear with a lower diff ratio.
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Old 06-26-2003, 03:42   #6 (permalink)
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Re: Cost v Benefits of diff change compared to manual conversion in v8 NC

Quote:
Originally Posted by WBT56
I have one, PM me if you are serious. V8 are no harder than I6 to convert, just an extra pipe to dodge. Most windsor/T5 combinations perform outstanding with 3.45, and don't perform better by going lower without mods to help it spin up quicker. I have no experience with autos in this department and won't comment.
Surprising as it may sound, you should be less likely to light up the rear with a lower diff ratio.
Interesting stuff, you will have a PM soon!


why would you spin less with a lower ratio....you would have thought much more....
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Old 06-26-2003, 03:48   #7 (permalink)
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Re: Cost v Benefits of diff change compared to manual conversion in v8 NC

Quote:
Originally Posted by hot_eb
why would you spin less with a lower ratio....you would have thought much more....
This is what everyone seems to think. Try this: Same car, same gearbox, same engine. Go from 3.08 to 3.23 to 3.45 to 3.91 and find the tendancy to actually light up the rears lessens. It did go much better though.
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Old 06-27-2003, 03:03   #8 (permalink)
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Re: Cost v Benefits of diff change compared to manual conversion in v8 NC

Quote:
Originally Posted by WBT56
You use the same tailshaft for auto or manual. V8
Even for fairlanes?
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Old 06-27-2003, 03:48   #9 (permalink)
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I have just done a conversion on a I6 and the front yoke has a different spline in the auto and manual. The auto has a keyway that will only line up in one spot on the gearbox output shaft, the manual seems to have the same spline just no keyway
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Old 06-27-2003, 03:50   #10 (permalink)
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Re: Cost v Benefits of diff change compared to manual conversion in v8 NC

Quote:
Originally Posted by cArSiK
Even for fairlanes?
Think about it. Engine hasn't moved, diff hasn't moved, gearboxes are the same length....why would a fairlane be any different?
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