Low gear set q's
#1625757
05/27/14 05:59 PM
05/27/14 05:59 PM
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Joined: Jan 2003
Posts: 2,937
A shed in England
Tig
OP
master
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OP
master
Joined: Jan 2003
Posts: 2,937
A shed in England
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OK, New motor makes peak torque @ 5300 and peak hp @ 6400 There is enough HP to go 150mph+. I'm figuring a 4:10 rear is too much since we go 7000 @ 142mph. It's a Dana 60 and the next gear down is a 3.73, would you use stock 727 g'box ratio's or a low gear set with a 30.5 inch dia tyre (including growth)? I've just broke the diff and probably damaged the box too so both will likely need rebuilding TIA. 
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: Low gear set q's
[Re: Tig]
#1625758
05/27/14 06:44 PM
05/27/14 06:44 PM
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Joined: Jul 2005
Posts: 1,301
Penna
70satelliteguy
pro stock
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pro stock
Joined: Jul 2005
Posts: 1,301
Penna
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"we go 7000 @ 142mph. " TIG that sounds like a lot of RPM for 142 MPH with 4;10's. We turn 7000 at about 152 MPH with 4;10's.  "I've just broke the diff " Wow must be a lot of power with new motor Mike 
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Re: Low gear set q's
[Re: 70satelliteguy]
#1625759
05/27/14 07:13 PM
05/27/14 07:13 PM
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Joined: Jan 2003
Posts: 2,937
A shed in England
Tig
OP
master
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OP
master
Joined: Jan 2003
Posts: 2,937
A shed in England
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What size tyre? This is with the 572 motor, 655 isn't in yet.
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: Low gear set q's
[Re: Tig]
#1625760
05/27/14 10:06 PM
05/27/14 10:06 PM
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Joined: Jul 2005
Posts: 1,301
Penna
70satelliteguy
pro stock
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pro stock
Joined: Jul 2005
Posts: 1,301
Penna
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"What size tyre?" Tig we run the 31.0/14.0/15 Goodyear. Not that far off from your 30.5 tire! I could be wrong but it seems like you could have a bit too much slippage in your converter  Just this past Friday night we went thru the traps with the shift light just blinking(set for 7000 rpm) at 154.03 MPH. Dana 4;10's . I tried the low gear set once with this combination but it did not help with 60 fts. at all. Car still will go 1.31 with stock set Mike p.s. Could you elaborate on breaking the Dana 
Last edited by 70satelliteguy; 05/27/14 11:18 PM.
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Re: Low gear set q's
[Re: 70satelliteguy]
#1625762
05/27/14 11:59 PM
05/27/14 11:59 PM
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Joined: Jan 2003
Posts: 2,937
A shed in England
Tig
OP
master
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OP
master
Joined: Jan 2003
Posts: 2,937
A shed in England
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Tyre is designated 29.5 x 10.5, I included growth. We broke teeth off the crownwheel, looks like a few had been cracked for a while  . I'll post some pic's up soon. I figured we'd gain some torque multiplication back with the low gear set, but was wondering how they'd hold up. Motor made 950ft/lb peak btw and calculated more with a 2.74 and 3.73 than a 2.45 and 4.10's.
Last edited by Tig; 05/28/14 12:02 AM.
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: Low gear set q's
[Re: Tig]
#1625763
05/29/14 09:30 PM
05/29/14 09:30 PM
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Joined: Mar 2006
Posts: 9,882
MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,882
MI, usa
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Mine goes thru at 6900@147 with a 4.10 and 10.5x31 M/T. Doug
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