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Low gear set in a 904 #382034
07/21/09 12:09 PM
07/21/09 12:09 PM
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Gilbert, AZ
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Aspen7695 Offline OP
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I am going to freshen my 904 and I am thinking about putting a low gear set in it. Have any of you done this? Did it lower your 60' time? Was it worth it?

Currently my Duster has a fairly mild 360 and the 60' is 1.60. I am hoping to get it a bit lower.

Raul

Last edited by rmvduster73; 07/21/09 12:10 PM.
Re: Low gear set in a 904 [Re: Aspen7695] #382035
07/21/09 12:24 PM
07/21/09 12:24 PM
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Newport, Mi
Evil Spirit Offline
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In your case it should help your 60' times, and is an easy swap. There has been many threads on this - might I suggest using the search for earlier posts?


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Re: Low gear set in a 904 [Re: Evil Spirit] #382036
07/21/09 02:12 PM
07/21/09 02:12 PM
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Shelby mi.
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JAKE68 Offline
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Something to consider is,is that no. on the et slip worth the expense in a low performance package? There are other was to lower your 60's wothout that gear set. What is your current combo? Those gear set are not cheep.


JAKES AUTOMOTIVE
Re: Low gear set in a 904 [Re: JAKE68] #382037
07/21/09 02:23 PM
07/21/09 02:23 PM
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Posts: 310
Michigan
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412 SB Duster Offline
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You don't have buy a after market low gear set there are plenty of stock low gear sets out there just have to find them. I would do it in a heart beat. Worked great in my car all the way down into the low 10s. Cheap way to get a lower powered or heavy car moving without putting more gear in it.

Re: Low gear set in a 904 [Re: 412 SB Duster] #382038
07/21/09 02:39 PM
07/21/09 02:39 PM

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I bought a 2.74 sungear and planetaries from Neal Chance Transmissions for my 904 here in Wichita for around $60.00 a few years back.

It was a street car that I took to the strip on occasion and I never noticed much of a difference.

It wasn't worth the hassle IMO., but might be in your application.

Re: Low gear set in a 904 #382039
07/21/09 02:45 PM
07/21/09 02:45 PM
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Kalispell Mt.
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HotRodDave Offline
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I did notice a differance in my car with them, I just had a 318 and 2.76 gears.

They are not really expensive for a decent used set. I would not pull the trans apart to add them but I would sure as the world spend a few bucks to put em in if I had the trans apart already.

Not only are the lower ratios to help get the car moveing they are much stronger than the normal ones.

I used to have a few sets, I don't remember if I sold them all or not, I will look tonight. PM me if your interested in one.


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: Low gear set in a 904 [Re: JAKE68] #382040
07/21/09 03:06 PM
07/21/09 03:06 PM
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Gilbert, AZ
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Aspen7695 Offline OP
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The 360 makes about 400 HP. It has an 8" converter that flashes at 4500. Rear end has 4.56 with a spool. Cal Trac bars, monoleafs and Rancho's. Tires are 29.5X9. I have 5 1/2" of front end travel. I have a set of 4.86 gears that I can put in the rear end.

I am going to freshen the tranny because it has plenty of passes on it and I don't want to take a chance on breaking it.

Raul

Re: Low gear set in a 904 [Re: Aspen7695] #382041
07/21/09 09:58 PM
07/21/09 09:58 PM
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On a related note does anyone make a 2.28 first gear for the 904? I am pretty sure that Pro Trans does but I was thinking that A&A might too but did not see it on their website?


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Re: Low gear set in a 904 [Re: Irun5snd8th] #382042
07/21/09 10:07 PM
07/21/09 10:07 PM
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On the south side of Nowhere
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Quote:

On a related note does anyone make a 2.28 first gear for the 904? I am pretty sure that Pro Trans does but I was thinking that A&A might too but did not see it on their website?




Every A&A Catalog for the last couple of years says

"Straight-cut 904 Gear Sets" Call for Info

I'm going to take a WAG and say, Rick probably didn't see the need
to tool up for these, since Pro-Trans already makes them.

I'm sure it's an expensive undertaking and probably just buys them from Dave Smith.

Again, just a guess.

Re: Low gear set in a 904 [Re: S/ST 3040] #382043
07/23/09 01:56 AM
07/23/09 01:56 AM
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Phoenix, AZ
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MoparBilly Offline
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Raul,
Stay with the 4.56's, put in the low-gearset, you and the Duster will be pleased...I guarantee it.

In my Valiant, I have 4.30's and a 30 tall tire, and I let the low-gearset do the work.


"Livin' in a powder keg and givin' off sparks" 4 Street cars, 5 Race engines
Re: Low gear set in a 904 [Re: HotRodDave] #382044
07/23/09 03:24 AM
07/23/09 03:24 AM
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Gainesville,FL
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"Not only are the lower ratios to help get the car moveing they are much stronger than the normal ones" I've never heard this,but that they were the weaker of the choices. What makes them stronger?I'd run the low gearset in low hp street/strip cars as they often are slightly quicker in the right combo.

Re: Low gear set in a 904 [Re: MoparBilly] #382045
07/23/09 06:49 AM
07/23/09 06:49 AM
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Gilbert, AZ
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Aspen7695 Offline OP
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MoparBilly I'll go with your suggestion. I'll have Brian Downing put the low gear set in when he freshens it.

Raul

Re: Low gear set in a 904 [Re: Aspen7695] #382046
07/23/09 06:58 AM
07/23/09 06:58 AM
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Shelby Twp Michigan
727jim Offline
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If your still looking for a low gear set let me know I have several for the 904's

Re: Low gear set in a 904 [Re: Aspen7695] #382047
07/23/09 07:03 AM
07/23/09 07:03 AM
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St. Louis Mo.
10 o to go Offline
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St. Louis Mo.
ive run low gear in my 904s and in my 727s currently not in my new motor combo but putting one back in.
Also that changes 2nd gear if i read the gear ratios from stock to the low gear set.
my 4.30s become 4.5s then .
last year best 60ft 1.35 to 1.37
better motor now 1.37 to 1.40 .
believe i will get 1.32 to 1.37
hopefully by next month
don

5370184-Beechbend.jpg (17 downloads)

2009 418" build dan smith built new 9.96 131.82 6.23 108 1.30 60 foot best to date 9/15/09 8in 727 430 dana 2860 lb 3040 lb w driver
Re: Low gear set in a 904 [Re: goldmember] #382048
07/23/09 07:33 AM
07/23/09 07:33 AM
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Newport, Mi
Evil Spirit Offline
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Quote:

"Not only are the lower ratios to help get the car moveing they are much stronger than the normal ones" I've never heard this,but that they were the weaker of the choices. What makes them stronger?I'd run the low gearset in low hp street/strip cars as they often are slightly quicker in the right combo.




Some of the standard gearsets have aluminum carriers and 3 or 4 pinions. The low gearsets I have seen most have had steel carriers and all had 4 pinions. We've run the factory low gearsets in 700hp, 3000lb cars with no failures.


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Re: Low gear set in a 904 [Re: MoparBilly] #382049
07/23/09 12:04 PM
07/23/09 12:04 PM
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Casa Grande,Arizona
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DennisJ Offline
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Billy:

I thought that "your" Valient was supposed to be your daughters race car.

Do you think my Scamp would like a low gear set? I've been thinking of doing that whenever I go through the tranny.

Dennis Jokela


I started out with nothing,and I still have most of it.
Re: Low gear set in a 904 [Re: DennisJ] #382050
07/23/09 06:59 PM
07/23/09 06:59 PM
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Posts: 498
El Dorado Ca
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65signet Offline
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we run low gear sets in both cars


1965 Plymouth Barracuda 273 M/SA
1970 Plymouth Duster 360/904 10.60s with J heads






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