sambo_xr6t Member 157 Member For: 15y 4m Posted 26/11/09 01:33 PM Share Posted 26/11/09 01:33 PM hey guys dont no much about this can any 1 tell me what stock ba diff ratio is and whats the best to get for like street, quater mile Link to comment Share on other sites More sharing options...
seduced Need more power. Now taking donations. Member 753 Member For: 15y 8m 20d Gender: Male Posted 27/11/09 12:45 AM Share Posted 27/11/09 12:45 AM Manual or auto?I believe all T56 manuals are 3.73. Not sure what the 5 speed or autos run. Link to comment Share on other sites More sharing options...
bcl Toughest BA Turbo Lifetime Members 3,408 Member For: 21y 10m 22d Gender: Male Location: Sydney Posted 27/11/09 01:02 AM Share Posted 27/11/09 01:02 AM BA auto and manual both share the same 3.45 ratio diff.BF manual 3.73; ZF auto has 2.73 diff.How much power do you have, and auto or manual.Brian Link to comment Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,323 Member For: 19y 1m 24d Gender: Male Location: Perth Posted 27/11/09 01:11 AM Share Posted 27/11/09 01:11 AM IIRCBa 4 speed auto 3.44Ba 5 speed man 3.44Ba/bf 6 speed man 3.73Bf 6 speed auto 2.77 (super low first gear in the ZF)I ran 4.09's with a t56 and is was super punchy on the street but a tad short on the strip but my T56 has the following ratios1st 2.97,2nd 2.07,3rd 1.43,4th 1.00,5th.8,6th.62the stock ratio are1st 2.66,2nd 1.78,3rd 1.3,4th 1.00,5th 0.74,6th 0.5IMHO the lower gear set is better suited to the stock 3.77 final drive ratio.the stock ratios with 4.09 would probably be quite good if you do the maths the difference between the 3.77 and 4.09 is only 7.9%just depends what you want. The stock g/box ratios and the stock diff ratio was okay but i prefer the lower 1st,2nd and 3rd in m,y T56 and the stock diff ratios as its punchier down low and still cruises nice in 6th Link to comment Share on other sites More sharing options...
sambo_xr6t Member 157 Member For: 15y 4m Posted 27/11/09 05:58 AM Author Share Posted 27/11/09 05:58 AM I have ba auto and will have about 310rwkw in a fortnight Link to comment Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,323 Member For: 19y 1m 24d Gender: Male Location: Perth Posted 27/11/09 07:21 AM Share Posted 27/11/09 07:21 AM auto=leave it alone. you could goto 3.77 for a slight lift but i wouldnt go any lower than that otherwise your cruising rpms will suffer and you will have traction problems in the lower gears Link to comment Share on other sites More sharing options...
Peteos13 Donating Members 307 Member For: 11y 7m 12d Gender: Male Posted 12/11/13 07:09 AM Share Posted 12/11/13 07:09 AM Thinking about going a 3:77. I've got a ba 4 speed auto. 285 rwkw. What's the pros an cons? Do I need to re tune? I want better pick up but it's my daily driver ute. Link to comment Share on other sites More sharing options...
Peteos13 Donating Members 307 Member For: 11y 7m 12d Gender: Male Posted 13/11/13 05:38 AM Share Posted 13/11/13 05:38 AM Can anyone help me out with any info? ^^ Link to comment Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,323 Member For: 19y 1m 24d Gender: Male Location: Perth Posted 13/11/13 05:41 AM Share Posted 13/11/13 05:41 AM OkayFaster acceleration,slight increase in lag, slight reduction in cruising fuel economy Yes. Diff gear will need to be changed in Tune other wise shift points and speed will be outYou will get that. Link to comment Share on other sites More sharing options...
Peteos13 Donating Members 307 Member For: 11y 7m 12d Gender: Male Posted 13/11/13 05:51 AM Share Posted 13/11/13 05:51 AM Thanks Ralph. Why is there more lag? I thought it would start spooling earlier Do many people change ratios in xr t's? Link to comment Share on other sites More sharing options...
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