Help! 700r4 Pressure Testing - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jakes-66-K10 · 08-20-2005, 12:51 PM

According to BowTieOverdrives, they recommend doing a transmission pressure test prior to a test drive on all 700r4's. I have everything ready for this, but they are closed today! Grrr...

Wondering if anyone else has a pressure gauge, or even better the sheet they give you where you write in the pressures. I just need to know where the pressure is supposed to be at.

I did see the charts on TCIAuto below. But when they give you a range of numbers, I don't know if my need fluctuating between those numbers are normal, or if it should give a steady reading in every gear. So far my lowest gear fluctuates the most.

86k10 · 08-21-2005, 12:42 AM

Some of their numbers don't jive with my books, but then I have no faith in TCI transmissions. The needle will bob a little sometimes that's normal.

72GMC51 · 08-21-2005, 11:00 AM

The readings I got on my 1993 – 4L60 were P-70-165-170. R-115,260,270. N-70,160,170. OD-70,170,175. 3rd-70,170,190. 2nd-185,180,180. 1st-185,180,180. I have a list of readings from ATSG (Automatic Transmission Service Group) manual that I have found info in. File was to big to post can send you e-mail if you would like.The reading you posted seem very high, I am not a Auto trany expert but all of the info I have is those are high.
I was told by Bow Tie Overdrive that my pressures were within the range and that corresponds with the readings in the book, although there are actually high according to the 84 Camaro GM service manual I have which is for a 700r4. Both of these tranys are the same basic thing both have TV cables.
Hope this helps
JC

**guyryan100** · 08-21-2005, 06:15 PM

BTO told me that the important thing is that you have low pressure with no throttle (around 80 psi) and an immediate steady increase as you throttle. And of course not exceeding the max pressure. If it doesn't jump up immediately, that's the problem.

08-20-2005, 12:51 PM	#1
Jakes-66-K10 Registered User Join Date: Aug 2004 Location: Idaho Posts: 640	Help! 700r4 Pressure Testing According to BowTieOverdrives, they recommend doing a transmission pressure test prior to a test drive on all 700r4's. I have everything ready for this, but they are closed today! Grrr... Wondering if anyone else has a pressure gauge, or even better the sheet they give you where you write in the pressures. I just need to know where the pressure is supposed to be at. I did see the charts on TCIAuto below. But when they give you a range of numbers, I don't know if my need fluctuating between those numbers are normal, or if it should give a steady reading in every gear. So far my lowest gear fluctuates the most. Attached Images

08-21-2005, 12:42 AM	#2
86k10 Registered User Join Date: Feb 2003 Location: Bertrand, Nebraska Posts: 355	Some of their numbers don't jive with my books, but then I have no faith in TCI transmissions. The needle will bob a little sometimes that's normal. __________________ 98 Neon 97 Grand Prix GT 02 Grand Prix 40th Anniv. 86 GMC 5.0 77 Olds 98 6.6 REAL AMERICANS, DRIVE AMERICAN

08-21-2005, 11:00 AM	#3
72GMC51 72GMC51 Join Date: Jul 2004 Location: Minnesota Posts: 233	700r4 pressure readings The readings I got on my 1993 – 4L60 were P-70-165-170. R-115,260,270. N-70,160,170. OD-70,170,175. 3rd-70,170,190. 2nd-185,180,180. 1st-185,180,180. I have a list of readings from ATSG (Automatic Transmission Service Group) manual that I have found info in. File was to big to post can send you e-mail if you would like.The reading you posted seem very high, I am not a Auto trany expert but all of the info I have is those are high. I was told by Bow Tie Overdrive that my pressures were within the range and that corresponds with the readings in the book, although there are actually high according to the 84 Camaro GM service manual I have which is for a 700r4. Both of these tranys are the same basic thing both have TV cables. Hope this helps JC __________________ 72 GMC 2wd 1/2 long 350 700r4 A/C PS PB 4:10. Are they ever really finished Last edited by 72GMC51; 08-21-2005 at 11:02 AM.

08-21-2005, 06:15 PM	#4
guyryan100 Registered User Join Date: Sep 2001 Location: Cumming, GA Posts: 485	BTO told me that the important thing is that you have low pressure with no throttle (around 80 psi) and an immediate steady increase as you throttle. And of course not exceeding the max pressure. If it doesn't jump up immediately, that's the problem.



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