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Transmissions and Drivetrain Need help with your trans? Problems with your axle?

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Old 10-02-2009, 09:02 PM   #1
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Join Date: May 2007
Location: right behind you
Posts: 2,281
Car: '85 maro
Engine: Hybrid 3.4
Transmission: TH700 R4
Axle/Gears: 3.73 posi

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Looking for 3.9's for your 10 bolt?

Anyone interested in 3.9 gears for your 7.5" 10 bolt should take a look here (What is the BEST GEARING FOR A 91 FIREBIRD). Guy cuts them himself and is pretty reasonable on the price.
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Increasingly I find the difference between a 'fact' and opinion is the number of people that believe it.

3.4 block converted to roller valvetrain with 220/225 cam on 115 lsa, early '769' heads with 3500 valves, LS6 springs & mild porting, worked over heddman headers, 3500 plenum with ported 3400 lower & 'short star' 65mm throttle. 210hp at 5800ft (that's 270hp at sealevel )
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Old 10-03-2009, 09:47 AM   #2
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Location: Logan, UT
Posts: 5,261
Car: '84 Trans Am WS6
Engine: LQ9 w/ Wegner LS6 heads
Transmission: 4L60E, seeking good used NV3550HD
Axle/Gears: 7.5" 3.23:1, posi, swapping to 8.5"

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Re: Looking for 3.9's for your 10 bolt?

Motive Gear sells them through Summit Racing.
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Old 10-03-2009, 09:18 PM   #3
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Join Date: May 2007
Location: right behind you
Posts: 2,281
Car: '85 maro
Engine: Hybrid 3.4
Transmission: TH700 R4
Axle/Gears: 3.73 posi

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Re: Looking for 3.9's for your 10 bolt?

I can't find them on summit. Did you call motive?
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Increasingly I find the difference between a 'fact' and opinion is the number of people that believe it.

3.4 block converted to roller valvetrain with 220/225 cam on 115 lsa, early '769' heads with 3500 valves, LS6 springs & mild porting, worked over heddman headers, 3500 plenum with ported 3400 lower & 'short star' 65mm throttle. 210hp at 5800ft (that's 270hp at sealevel )

Last edited by bl85c; 10-03-2009 at 10:15 PM.
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Old 10-05-2009, 11:43 AM   #4
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Join Date: Oct 2008
Location: Logan, UT
Posts: 5,261
Car: '84 Trans Am WS6
Engine: LQ9 w/ Wegner LS6 heads
Transmission: 4L60E, seeking good used NV3550HD
Axle/Gears: 7.5" 3.23:1, posi, swapping to 8.5"

Classifieds Rating: (0)
Re: Looking for 3.9's for your 10 bolt?

Nope, just looked in my current Summit catalog, for Sep-Oct 2009, Page 224, right column, halfway down. Motive Gear Performance Ring-and-Pinion Sets MGR-G875390 3.90 $209.95. So I went to www.summitracing.com and searched that, just thgis second, it comes up. Here's a link:
http://www.summitracing.com/search/?...-G875390&dds=1
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Old 10-05-2009, 07:44 PM   #5
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Join Date: May 2007
Location: right behind you
Posts: 2,281
Car: '85 maro
Engine: Hybrid 3.4
Transmission: TH700 R4
Axle/Gears: 3.73 posi

Classifieds Rating: (0)
Re: Looking for 3.9's for your 10 bolt?

Ah, wonder why they never came up in my search.
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Increasingly I find the difference between a 'fact' and opinion is the number of people that believe it.

3.4 block converted to roller valvetrain with 220/225 cam on 115 lsa, early '769' heads with 3500 valves, LS6 springs & mild porting, worked over heddman headers, 3500 plenum with ported 3400 lower & 'short star' 65mm throttle. 210hp at 5800ft (that's 270hp at sealevel )
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Old 10-24-2009, 03:53 PM   #6
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Re: Looking for 3.9's for your 10 bolt?

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Old 10-25-2009, 10:12 AM   #7
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Join Date: Nov 2005
Location: rochdale,massachusetts
Posts: 522
Car: my 1983 Z28 and my 2006 honda vtx 1
Engine: 355 sbc hyd roller cam dart heads
Transmission: t-5 for now
Axle/Gears: built 10 bolt with 3.73s

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Re: Looking for 3.9's for your 10 bolt?

hope you dont plan on using the highway with 4.30's......... 3.73s or 3.90's would be better
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Sbc 355,dart iron eagle platinum heads, comp cams nx276 hyd roller camshaft, master power t76 .96 a/r turbo,CSU 750 cfm blow thru carburetor, TKO 600 , inland empire drive shaft,3.73s with tons of other mods!!!!!!!!!
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Old 10-25-2009, 10:12 AM
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