3.73 or 4.10 gears in a A4?
04-28-2002, 08:04 PM
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3.73 or 4.10 gears in a A4? I had 3.73 in my '99 firehawk. Was wondering if I should put in 4.10s this time in my 2001. I have a 3300 torque converter. I drag race every week at the track, and I also drive it on the street. 3.73 was ok but if 4.10s help a lot at the track without it being too much on the street i would go with the 4.10s. Can anyone help me on this?
<small>[ May 02, 2002, 12:17 PM: Message edited by: Pro Stock John ]</small>
<small>[ May 02, 2002, 12:17 PM: Message edited by: Pro Stock John ]</small>
04-30-2002, 09:16 PM
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Re: 3.73 or 4.10 gears in a A4? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif"> With 4.10 you'll need ET Drags to gain .05 of a second. Plus you'll be out of your powerband unless you have a super radical heads and cam that will pull to 7000rpm.
</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">You can expect to cross the 1/4 at about 6600 but you can alter that by running a 28 in tall slick which should drop your rpm back down to about 6300 which should be about right for a car with bolt ons and maybe some 1.8 ratio rockers
</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif"> With 4.10 you won't hit OD in the 1/4 mile like you will with 3.73.
</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I think he meant you will hit od with 4.10's instead of noty hitting od
Josh S.
</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">You can expect to cross the 1/4 at about 6600 but you can alter that by running a 28 in tall slick which should drop your rpm back down to about 6300 which should be about right for a car with bolt ons and maybe some 1.8 ratio rockers
</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif"> With 4.10 you won't hit OD in the 1/4 mile like you will with 3.73.
</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I think he meant you will hit od with 4.10's instead of noty hitting od
Josh S.
05-01-2002, 12:35 AM
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Re: 3.73 or 4.10 gears in a A4? This has been discussed many times but basically you want to run 3.73 with an auto and 4.10 with an M6.
With 4.10 you'll need ET Drags to gain .05 of a second. Plus you'll be out of your powerband unless you have a super radical heads and cam that will pull to 7000rpm.
Most guys who did this switch have gained absolutely nothing - even with traction.
With 3.73 you won't hit OD in the 1/4 mile like you will with 4.10.
Chris
<small>[ May 01, 2002, 01:22 PM: Message edited by: OBSSSD@work ]</small>
With 4.10 you'll need ET Drags to gain .05 of a second. Plus you'll be out of your powerband unless you have a super radical heads and cam that will pull to 7000rpm.
Most guys who did this switch have gained absolutely nothing - even with traction.
With 3.73 you won't hit OD in the 1/4 mile like you will with 4.10.
Chris
<small>[ May 01, 2002, 01:22 PM: Message edited by: OBSSSD@work ]</small>
05-01-2002, 09:38 PM
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Re: 3.73 or 4.10 gears in a A4? Thanks for your replies, I believe I will go with the 3.73.
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05-02-2002, 09:08 AM
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Re: 3.73 or 4.10 gears in a A4? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Ls1 382ci SS:
<strong>on an a4 with 4.10's if you drive on expressway expect high rpm's. I would stick with the 3.73's.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">The differnce is like 300 rpms. Its not that bad.
I ran 4.10's with the stock motor and feel it was simply too much gear. Now, with this cam... <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
<strong>on an a4 with 4.10's if you drive on expressway expect high rpm's. I would stick with the 3.73's.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">The differnce is like 300 rpms. Its not that bad.
I ran 4.10's with the stock motor and feel it was simply too much gear. Now, with this cam... <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
