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Am I OVER-GEARED
#1028447
07/08/11 05:34 PM
07/08/11 05:34 PM
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Joined: Oct 2004
Posts: 513
HOUSTON,TEXAS
FIREGUY12
OP
mopar
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OP
mopar
Joined: Oct 2004
Posts: 513
HOUSTON,TEXAS
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Here is the scoop trying to decide which way to go on the next gear. Here is the current combo 3000 lbs. 71 duster 454 ci small block mopar powerglide 1.80 first gear 8 inch converter 5300 stall 4.56 Rear gear 14x32 tire with a 105 roll out 1050 dominator crosses at 6500 Rpm H.P. according to dyno sheet 633 h.p. at a low 5700 rpm 650 ft. lbs torque @ 4600 rpm Shift ay 6500 rpm Ran 1.41 60 ft 4.11 330ft 6.41 1/8 th 8.40 1000ft 10.11 1/4 131.43 mph Since I broke the case on the glide thinking about changing the 1.80 gear set to a 2.08 or 2.11 while its down in hopes of picking up the 60 ft. This engine is difficult to run due to its unusual power band. Any suggestion moparts. Is this a good move or should I go up on the rear end gear? http://www.youtube.com/watch?v=QQZQsoXCpvA
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Re: Am I OVER-GEARED
[Re: FIREGUY12]
#1028451
07/08/11 05:57 PM
07/08/11 05:57 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Your a couple hundred RPM over what max should be... as a rule of thumb you want to cross the line 10% over peak HP RPM... which in your case would be 6300 or so... big torque engines can use less than 10% so it can pull harder 
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Re: Am I OVER-GEARED
[Re: MR_P_BODY]
#1028453
07/08/11 06:00 PM
07/08/11 06:00 PM
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Joined: Apr 2005
Posts: 2,128
Salt Lake City
camastomcat
top fuel
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top fuel
Joined: Apr 2005
Posts: 2,128
Salt Lake City
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Quote:
Your a couple hundred RPM over what max should be...
as a rule of thumb you want to cross the line 10%
over peak HP RPM... which in your case would be 6300
or so... big torque engines can use less than 10% so
it can pull harder
It seems wrong that it makes more tourqe than HP?
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Re: Am I OVER-GEARED
[Re: camastomcat]
#1028454
07/08/11 06:02 PM
07/08/11 06:02 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
Your a couple hundred RPM over what max should be...
as a rule of thumb you want to cross the line 10%
over peak HP RPM... which in your case would be 6300
or so... big torque engines can use less than 10% so
it can pull harder
It seems wrong that it makes more tourqe than HP?
Not really
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Re: Am I OVER-GEARED
[Re: FIREGUY12]
#1028456
07/08/11 06:07 PM
07/08/11 06:07 PM
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Joined: Apr 2005
Posts: 2,128
Salt Lake City
camastomcat
top fuel
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top fuel
Joined: Apr 2005
Posts: 2,128
Salt Lake City
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Quote:
What about the 2.08 first gear versus the current 1.80. do you think that will help the 60 ft.
It might, but I think they are weaker in strength. Are they going to be straight cuts?
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Re: Am I OVER-GEARED
[Re: FIREGUY12]
#1028457
07/08/11 06:10 PM
07/08/11 06:10 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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A 2.08 would help in the 60' IF you dont loose traction... you would gain more torque with them.... are you sure your chassis is working the best it can EDIT I think you have a bit too much stall on the conv... your well past peak torque and its falling at higher revs
Last edited by MR_P_BODY; 07/08/11 06:12 PM.
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Re: Am I OVER-GEARED
[Re: earthmover]
#1028462
07/08/11 10:09 PM
07/08/11 10:09 PM
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Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
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Quote:
you know what mr.p said makes alot of since to me ...about the verta to big....i had a 340 with a small solid cam and ported heads and i changed everything i could think of to make the car 60' even the verta but i went to a smaller verta(8") from a 9.5 5000 the 8" was a 5600 car didnt lose any but didnt gain a thing....now that i think about it if i would have put maybe a 4000/4500 or even a 3800 car may have been alot better then it was...something to think on...sorry for the hi jack just had to share my ex. mike 
Wow, 650 at 4600? You have way too much converter. I'd use about a 4400 with a 1.76/1.80 glide. You don't need more 1st gear, you have the torque to pull that 1.80 gear, you just need to get the engine in that powerband.
You could probably use less gear in the rear as well. With that torque I wouldn't be surprised if it ran the same shifting at 6000.
I should add that I use a 4200 converter. Before with the 340 I was using a 4600 but I have a low gear 904 so I'm sure that helps make up for any lack of stall speed.
Last edited by Guitar Jones; 07/08/11 10:17 PM.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Am I OVER-GEARED
[Re: Guitar Jones]
#1028463
07/08/11 10:44 PM
07/08/11 10:44 PM
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Joined: Feb 2005
Posts: 20,173
PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,173
PA.
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Why did the tranny case break. I've gone 8.50's with stock powerglide cases and others have gone a lot faster than that. How's the pinion angle.
1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27
Livin and lovin life one day at a time
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Re: Am I OVER-GEARED
[Re: FIREGUY12]
#1028465
07/09/11 12:23 AM
07/09/11 12:23 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
In a back half car the cars tend to twist even thou you may not see it. I run a front engine plate and a mid plate. The tranny is bolted down to the trans crossmember. So when the chaasis flexes the weakess point break. On a poweglide the stock cases are weak. I have the JW bell housing and tail shaft. Glides tend to crack right above the shifter arm as mine did. I should have not bolted the tail housing down and the tranny could have move with the chassis and not broke. I will upgrade to an aftermarket case to fix this problem.
Are you using a solid trans mount with a front and
mid plate.... use a stock rubber trans mount
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