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Old 02-21-2008, 02:53 PM   #101
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Jag Drivetrain

X Tpe rear

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Old 02-21-2008, 03:45 PM   #102
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Originally Posted by hurtinfocus View Post
^ because the front and rear have to have the correct ratios with the transfer case or it will not work properly
I was refering to changing out the ring and pinion in the rear axle to match the front.... becuase it would be easier and cheaper than to do the gearing in the transaxle.
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Old 02-21-2008, 09:50 PM   #103
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I was refering to changing out the ring and pinion in the rear axle to match the front.... becuase it would be easier and cheaper than to do the gearing in the transaxle.
Just copy the Jaguar ratios. Problem solved.
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Old 02-21-2008, 11:50 PM   #104
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I was refering to changing out the ring and pinion in the rear axle to match the front.... becuase it would be easier and cheaper than to do the gearing in the transaxle.
Wouldn't having twin layshafts with two final-drive ratios in the transmission cause problems with this?
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Old 02-22-2008, 08:02 AM   #105
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Wouldn't having twin layshafts with two final-drive ratios in the transmission cause problems with this?
Jag board responce..

"transfer case has no ratio...

like I said the tranfer case output is the same rpm as the transmision output... what you need to do is make sure the front and rear diff have the EXACT same ratio as each other.

now what are you doing with this car? If you want acceleration, pick a big ratio, if you want highway peace and quiet.. a smaller one"
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Old 02-22-2008, 12:11 PM   #106
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ok, so what we would have to do is make the existing final drive ratio of the focus set equal to the 40%, and figure out what the 60% in relation to that WOULD be for the proper rear split?
If this is the case, then the rear would need a 5.73 gear ratio.....which doesnt seem right

or is the guy saying that the two ratios must be equal and the transfer case is what sets them to the 40/60?

im thinking the latter is the case, meaning a 3.82 is needed in the rear for an MTX-75
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Old 02-22-2008, 12:22 PM   #107
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for *&giggles......do they list the ratios of the jag trans final drive and of the jag rear diff?
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Old 02-22-2008, 12:28 PM   #108
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http://forums.roadfly.com/forums/jag...type/forum.php
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Old 02-22-2008, 12:44 PM   #109
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this is all i have been able to find so far......but it seems wrong for some reason:

"Yes, the final drive ratio can be determined from the posted information. Both the 2.5 and the 3.0 auto and manual have a drivetrain ratio (normally called rear end ratio on RWD's) of 2.53 to 1. The actual final drive ratio which takes into the overdrive ratio of the transmission and tire radius for the auto is 2.66 to 1 and the manual is 2.92 to 1.

As long as there is no slip in the transmissions or clutches (yes the auto has a clutch also) you can use the same ratio of speed to rpm and get to the rpm in high gear for any speed.

Does this mean that the auto has a higher top speed than a manual? Yes and no. If they both had unlimited HP the auto could go faster. With the same HP the manual will be faster due to the lower gearing allowing the motor to rev higher producing more HP. Also the auto will have greater friction losses in the transmission reducing available HP."
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Old 02-22-2008, 02:02 PM   #110
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Quote:
Originally Posted by hurtinfocus View Post
ok, so what we would have to do is make the existing final drive ratio of the focus set equal to the 40%, and figure out what the 60% in relation to that WOULD be for the proper rear split?
If this is the case, then the rear would need a 5.73 gear ratio.....which doesnt seem right

or is the guy saying that the two ratios must be equal and the transfer case is what sets them to the 40/60?

im thinking the latter is the case, meaning a 3.82 is needed in the rear for an MTX-75
..

If you had a 4.06 final drive you use the same exact ratio in the rear diff

If you wanted more rear bias I would assume a taller setting in the rear diff so it spins faster.
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