Lets talk gears !

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chadrad66

chadrad66

chadrad66
Joined
Jul 27, 2008
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south georgia
Hey yall broke my pig last night at test/tune. What gear would yall think for street/strip [bracket] racin . It now has 5.13 35 spline strange axles 345cu ,m1 dp750,557mpsolid cam,hookerheaders,weighs3317w/ me been shifting at 6500 conservatively ,runs 7.78 reg. 1/8 mile.I was considering 4.30 cause i like to drive to town monthly but i know you cannot have it all any suggestions would bee very help ful . :-D
 
4.30 would be a good choice, we run 4.30 in our Duster, it's bearable to drive on the street . Good luck , Dane
 
I agree. How tall are your tires?
 
chadrad66 said:
Hey yall broke my pig last night at test/tune. What gear would yall think for street/strip [bracket] racin . It now has 5.13 35 spline strange axles 345cu ,m1 dp750,557mpsolid cam,hookerheaders,weighs3317w/ me been shifting at 6500 conservatively ,runs 7.78 reg. 1/8 mile.I was considering 4.30 cause i like to drive to town monthly but i know you cannot have it all any suggestions would bee very help ful . :-D
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I am surprised that an 8 3/4 broke behind a small block. Are you running slicks and a trans brake? What broke in the rear. The reason I'm asking is to try to make my 5.13 bullet-proof.
 
If more strip than street 4.30 more street than strip 4.10 You didnt mention manual or auto. Stall will determine gear also on street ,as at cruise speed you need a gear low enough to keep converter locked so heat doesnt fry the tranny
 
Id run a 4:10-4:30 gear .



Did your 8.75 break on the line ?

You NEED to pull the trans out and inspect it, especially the sprag.
 
496dart said:
Id run a 4:10-4:30 gear .



Did your 8.75 break on the line ?

You NEED to pull the trans out and inspect it, especially the sprag.
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It broke just after 2nd gear shift pushed cap off bolts still torqued car the previous owner used the brake alot when i got car we un hooked it but i think it was weakened has 35 spline strange axles and spool w richmond gear ordered mark williams steel caps :cheers:
 
We run 4.56s and 325-50 bfg s (28") and it is not too bad. run 12.30s in the 1/4.
 
i have a set of 4.86 with a 35 spline spool..im useing 4.10's. i am going to get some 4.30's. 4.86 is too much for my small block. i have never used the 4.86's
 
what broke? 8 3/4 very seldom break without a reason such as pinion angle which is often overlooked, check angle and back brace housing should fix problem.....i'd run 4.30s trac 4.10 street.... or go bb and dana jmop!!
 
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