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What should I upgrade first...transmission or rear end?

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Old 01-19-2010, 02:48 PM
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Default What should I upgrade first...transmission or rear end?

I'm trying to go decently fast while staying stock internals for now. Eventually (sometime this year), I plan on being cam only. My current mods are a 3000 stall, full bolt ons, and some basic suspension mods. The car has about 75,000 miles...still on the stock transmission and rear. The transmission is the original transmission that came with the car, but the rear has maybe 40-50,000 miles on it (upgraded to a rear out of a 6 speed). I'm going to be going with a bigger stall soon, which kind of worries me. I'm running ET Streets and was doing decent was the smaller stall (high 1.6 60's to low 1.7's). With the bigger stall should I be more worried about the rear end or transmission going first? I know both need to be upgraded by the time the cam goes in, but that won't be for a while. Thanks for the help.
Old 01-19-2010, 03:15 PM
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I would vote for rear.
Old 01-19-2010, 03:58 PM
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i vote rear
Old 01-19-2010, 04:21 PM
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No matter what you upgrade the weakest link in the whole scheme of things is what will probably break first....a built transmission will kill the rearend....a built rearend can take the stock driveshaft out...etc, etc.
Old 01-19-2010, 06:15 PM
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Both need to be done, but if you absolutely can't do them both at the same time then I would say transmission first, simply because a working transmission is far more valuable than a working 10-bolt rear. You can use the money from the sale of your stock tranny to get you started on your rear end whereas selling a 10-bolt won't bring hardly any money. Plus, if you blow the 10-bolt it's only maybe $100 to replace it.
Old 01-19-2010, 06:26 PM
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toss a coin. that's my .02

I did my transmission first b/c that happened to be what went first.

With talking to the folks that sell rear ends. They'll tell you the first thing to go on a 10 bolt is the posi unit. Not much to worry about there.

If you do the transmission, do 1350 U Joints with a 1350 yoke on the 10bolt and a good driveshaft.
Old 01-19-2010, 06:31 PM
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Originally Posted by spoonraker
Both need to be done, but if you absolutely can't do them both at the same time then I would say transmission first, simply because a working transmission is far more valuable than a working 10-bolt rear. You can use the money from the sale of your stock tranny to get you started on your rear end whereas selling a 10-bolt won't bring hardly any money. Plus, if you blow the 10-bolt it's only maybe $100 to replace it.
I didnt think of it this way but he is deffinately right!

Build a 4L80E
Old 01-19-2010, 07:05 PM
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build a 400.
Old 01-19-2010, 07:39 PM
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I did my transmission first (RPM) now my (Moser) 9inch is on it's way in. Transmission first in my opinion.
Old 01-19-2010, 08:18 PM
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rearend ftw! the rear will go long before the tranny. ive been beating the **** out of my tranny for two years now with no problems and i have a built rear/DS. just my .02
Old 01-19-2010, 09:05 PM
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ive seen trannies go out well before the rear...buddy of mine was in the same boat, he was turning 1.50 60's on the stock trans/rear.......trans went out first
Old 01-19-2010, 09:33 PM
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I vote rear end..
Old 02-01-2010, 11:32 PM
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Just wanted to get more opinions on this. My goal for now (I plan on taking my car out of storage late February/early March) is 1.5X 60's stock internals. Should I be concerned about my rear end and/or trans going while I'm still stock internals?
Old 02-02-2010, 04:34 AM
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the rear won't last cutting those 60's
Old 02-02-2010, 08:07 AM
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Originally Posted by spoonraker
Both need to be done, but if you absolutely can't do them both at the same time then I would say transmission first, simply because a working transmission is far more valuable than a working 10-bolt rear. You can use the money from the sale of your stock tranny to get you started on your rear end whereas selling a 10-bolt won't bring hardly any money. Plus, if you blow the 10-bolt it's only maybe $100 to replace it.
This is the best advice, IMO. If you had a manual trans I would definitely say a rear though.

Larry
Old 02-02-2010, 08:17 AM
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I vote rear 1st as I will be putting them on sale this week.
Old 02-02-2010, 08:36 AM
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In a auto car the trans first.Six speed car needs the rear upgraded first.We have made the 10 bolts live for some time with a auto car.
Old 02-02-2010, 03:35 PM
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Since you have an auto build that first. I went through 3 transmissions and finally the rear broke. You can replace the rear with a stock if your are low on funds at any time. However if you put a 9" in and the tranny goes better have a couple grand laying for that. I vote tranny then save up for rearend.
Old 02-02-2010, 07:48 PM
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Originally Posted by cbra-klla
ive seen trannies go out well before the rear...buddy of mine was in the same boat, he was turning 1.50 60's on the stock trans/rear.......trans went out first
Mine too! Car had 24k miles on it and trans had Transgo kit in it. Worked great until it died.
Old 02-03-2010, 12:30 AM
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Originally Posted by spoonraker
Both need to be done, but if you absolutely can't do them both at the same time then I would say transmission first, simply because a working transmission is far more valuable than a working 10-bolt rear. You can use the money from the sale of your stock tranny to get you started on your rear end whereas selling a 10-bolt won't bring hardly any money. Plus, if you blow the 10-bolt it's only maybe $100 to replace it.
Nice


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