TH350 Front Pump

Chad E532 · 10-31-2009, 08:11 AM

Are there any measurable gains to be had by swapping out the stock front pump on a TH350 for one of the specialty race only pieces made by TCI, ATI, or other manufacturers? Do they require less horsepower to spin?
I still run a stock pump that has not had any modifications and I am doing some winter refurb so now is the time to change it out.
Let me know your thoughts on these high perf pumps.
Thanks,
Chad

buzzinhalfdozen · 11-01-2009, 08:12 AM

My understanding there are 2 types of aftermarket pumps. First they have an increased volume pump which is pretty self explanitary. Second they have a reduced volume pump which is used in alot of Comp applications, pumping less fluid requires less HP. I believe it would depend mostly on your application. My trans uses the reduced capacity pump however I'm sure there are some applications that it would not work well in. Joe

Alan Warman · 11-01-2009, 12:17 PM

You can take the pump body to the machine shop have .100 cut off the body and gears. ( The .100 I used is just a example some cut less some cut more) You will have to re cut the pump body O-ring grove or some people just run RTV around it. So does anybody have any other tricks they would like to share.

Chad E532 · 11-02-2009, 08:31 PM

Thanks for the replies.
My application is a 350 powered mid 11 sec Pro ET car that is morphing into a stocker. Are the after market pumps just machined stock pieces or do they offer other benefits?
Thanks,
Chad

Mike Taylor 3601 · 11-03-2009, 06:37 PM

Coan low volume I had was stock 350TH pump gears and housing milled down.Coan told me worth 6HP
@ wheels. I didn't gain 1/8 mile was told would be more of 1/4 mile improvment.I put low gear set in
at same time I think it made my converter that was already on the tight side tighter{lower gear set makes
converter tighter because multiplies torque more} and cost me any gain I should've seen,only difference
I could tell was normally running 45-50psi in front tires had to drop air to 30-35 to slow
reactions times back to same spot on tree.BTW if you want low gear set for 350TH they are made
from 700R4 planertary modified to fit 350TH If you have the skills you can make your own.
Mike Taylor 3601

Chipper Chapman · 11-03-2009, 08:53 PM

Aren't the 700's a 3.06 low gear not a 2.75?

10-31-2009, 08:11 AM	#1
Chad E532 Member Join Date: Jul 2008 Location: Lindstrom MN Posts: 156 Likes: 7 Liked 54 Times in 7 Posts	TH350 Front Pump Are there any measurable gains to be had by swapping out the stock front pump on a TH350 for one of the specialty race only pieces made by TCI, ATI, or other manufacturers? Do they require less horsepower to spin? I still run a stock pump that has not had any modifications and I am doing some winter refurb so now is the time to change it out. Let me know your thoughts on these high perf pumps. Thanks, Chad

11-01-2009, 08:12 AM	#2
buzzinhalfdozen Senior Member Join Date: Sep 2006 Location: Bellevue Ohio Posts: 984 Likes: 0 Liked 11 Times in 8 Posts	Re: TH350 Front Pump My understanding there are 2 types of aftermarket pumps. First they have an increased volume pump which is pretty self explanitary. Second they have a reduced volume pump which is used in alot of Comp applications, pumping less fluid requires less HP. I believe it would depend mostly on your application. My trans uses the reduced capacity pump however I'm sure there are some applications that it would not work well in. Joe __________________ Joe Buchanan SS/BX 3117

11-01-2009, 12:17 PM	#3
Alan Warman Member Join Date: May 2002 Location: San Angelo Tx Posts: 231 Likes: 0 Liked 0 Times in 0 Posts	Re: TH350 Front Pump You can take the pump body to the machine shop have .100 cut off the body and gears. ( The .100 I used is just a example some cut less some cut more) You will have to re cut the pump body O-ring grove or some people just run RTV around it. So does anybody have any other tricks they would like to share. __________________ Alan Warman STK 4107

11-02-2009, 08:31 PM	#4
Chad E532 Member Join Date: Jul 2008 Location: Lindstrom MN Posts: 156 Likes: 7 Liked 54 Times in 7 Posts	Re: TH350 Front Pump Thanks for the replies. My application is a 350 powered mid 11 sec Pro ET car that is morphing into a stocker. Are the after market pumps just machined stock pieces or do they offer other benefits? Thanks, Chad

11-03-2009, 06:37 PM	#5
Mike Taylor 3601 VIP Member Join Date: Oct 2008 Location: Somerset,Ky Posts: 1,361 Likes: 333 Liked 279 Times in 96 Posts	Re: TH350 Front Pump Coan low volume I had was stock 350TH pump gears and housing milled down.Coan told me worth 6HP @ wheels. I didn't gain 1/8 mile was told would be more of 1/4 mile improvment.I put low gear set in at same time I think it made my converter that was already on the tight side tighter{lower gear set makes converter tighter because multiplies torque more} and cost me any gain I should've seen,only difference I could tell was normally running 45-50psi in front tires had to drop air to 30-35 to slow reactions times back to same spot on tree.BTW if you want low gear set for 350TH they are made from 700R4 planertary modified to fit 350TH If you have the skills you can make your own. Mike Taylor 3601

11-03-2009, 08:53 PM	#6
Chipper Chapman Member Join Date: Jan 2004 Location: Belmont N.S. Canada Posts: 473 Likes: 246 Liked 166 Times in 71 Posts	Re: TH350 Front Pump Aren't the 700's a 3.06 low gear not a 2.75?