its CRITICAL to keep the trans fluid clean and ideally changed about every 70K miles and use of a auxiliary cooler that keeps the fluid temp under about 170F is going to extend service life a good deal longerWanderwilly said:I am going to change the fluid and filter on my 1994 Vette auto transmission .From what I have read I will drain about four quarts when I drop the pan. When I refill it will mix with the remaining fluid which if I understand the book correctly is a large amount.Is this O.K.? My friend next door,another car nut, gave me 5 qts. of Mobil 1 Synthetic ATF multi vehicle trans fluid. Can I use this? This is all new to me.My Vette is my hobby car.
Id also point out that adding an additional , properly sized trans cooler with the correct fluid transfer line sizes,with a powered fan,can very easily maintain the trans fluid temps in the 150F-170F range even under high stress performance application conditions

measure very carefully youll need to mount the transmission cooler in a location that allows clearance for both the cooler and its supply lines and in a location with easy access to outside air flow so the heated air can rapidly be replaced with cooler outside air, for effective heat reduction to the fluid to effectively take place.
ID suggest no smaller than AN#8 line (1/2") size and a 24000 lb weight rated cooler if you have the room to mount one on a serious race application, with a high stall speed torque converter.
https://www.summitracing.com/parts/der-15850/overview/
https://www.summitracing.com/parts/der-15900/overview/
https://www.summitracing.com/parts/flx-45908/overview/
http://www.fluidcapacity.com/



keep in mind automatic transmissions tend to add a significant amount of heat to radiators that use the lower section to cool the transmission, adding a large efficient trans fluid cooler to the car can also significantly reduce the heat loads on the radiator
many guys don,t realize that adding an oil and/or a transmission fluid cooler, with its own fan and radiator that allows those liquids to be cooled separately, to your engine and drive train, significantly reduces the heat load on the radiator, and generally allows the engine temps to decline noticeably. in fact just adding a high volume oil pan and a transmission cooler can drop your engine coolant temps 20F-30F in many cases, Id also point out that theres generally 3-5 quarts in the transmission oil pan and an additional 5-6quarts in the converter and lines to the trans cooler


remote mounted oil filters can be used along with an oil cooler to to increase transmission cooler efficiency, and the remote filter and cooler used on a transmission also tends to increase fluid capacity ,and as a result the systems cooling efficiency as the longer the fluid remains in transit outside the trans dissipating its absorbed heat, the use of a auxiliary fan equipped fluid cooler on a performance transmission with a high stall speed converter tends to significantly increase its potential durability.

a rather common issue with adding oil coolers, is that many of the coolers available can significantly restrict fluid flow because of the small restrictive internal cross section of the internal tubing, AN #6 and 3/8" tube coolers can be quite restrictive, the AN#8 are better but DUAL AN#8 coolers and AN#10 lines generally work the best, and there's also frequently limited space to position a cooler in the outside cool air flow mandating a powered fans.
the solution to both issues can and frequently does require use of two different oil coolers but placed in series this can further increase flow restrictions, the solution is in use of larger internal cross sectional area,transfer lines and mounting the twin coolers in parallel thus doubling the effective cross sectional area reducing the flow restriction the cooler potentially could produce if used in series
http://auto.howstuffworks.com/auto-part ... olers2.htm
viewtopic.php?f=57&t=176&p=12473&hilit=corvette+trans+cooler#p12473
viewtopic.php?f=80&t=10514&p=44478#p44478
http://etereman.com/blog/general-motors ... ansmission
viewtopic.php?f=71&t=662&p=9328#p9328
viewtopic.php?f=45&t=307&p=372&hilit=trans+fluid#p372
viewtopic.php?f=71&t=2817&p=7265&hilit=transmission+fluid#p7265
http://www.corvettebuyers.com/c4vettes/ ... enance.htm
viewtopic.php?f=71&t=748&p=2940&hilit=transmission+fluid#p2940
OK FIRST LOOK UP THE TRANSMISSIONS FLUID CAPACITY
and go to a local NAPA and get a WIX trans fluid filter, as they are decent quality and cheap, and should be replaced at each fluid change Id also strongly suggest a magnet in the oil pan
http://www.kjmagnetics.com/proddetail.asp?prod=D82SH
http://www.amsoil.com/shop/by-product/f ... e=58904-EA
HERES A LINK
http://fluidcapacity.com/
http://www.cartechbooks.com/techtips/autotransfluid
HERES YOUR PARTICULAR RESULT
1994 CHEVROLET CORVETTE 5.7L 8-cyl Engine Code [P]
LUBRICANTS & FLUIDS:
Engine Oil
Grade 1......API*[1]
Maximum Performance SAE 5W-30 Signature Series 100% Synthetic Motor Oil (ASLQT)
Performance Plus XL 5W-30 Synthetic Motor Oil (XLFQT)
Performance OE 5W30 Synthetic Motor Oil (OEFQT)
Above 0 F......10W-30
All TEMPS......5W-30
Manual Transmission,S6-40/ML9......GLS [2]
All TEMPS......
Synthetic Synchromesh Transmission Fluid (5W-30) (MTFQT)
Automatic Transmission,4L60-E......AF6 [3]
Signature Series Fuel-Efficient Synthetic Automatic Transmission Fluid (ATL) (ATLQT)
OE Fuel-Efficient Synthetic Automatic Transmission Fluid (OTLQT)
Standard Differential, Rear......GL-5
All TEMPS......80W-90
SEVERE GEAR 75W-90 Synthetic EP Lubricant (SVGQT)
75W-90 Synthetic Long Life Gear Lube (FGRQT)
SEVERE GEAR 75W-110 Synthetic EP Lubricant (SVTQT)
SAE 80W-90 Synthetic Gear Lube (AGLQT)
Limited Slip Differential, Rear......GL-5*
All TEMPS......80W-90 [4]
SAE 80W-90 Synthetic Gear Lube (AGLQT)
SEVERE GEAR 75W-90 Synthetic EP Lubricant (SVGQT)
75W-90 Synthetic Long Life Gear Lube (FGRQT)
SEVERE GEAR 75W-110 Synthetic EP Lubricant (SVTQT)
Fluids
Brake Fluid......HB
AMSOIL Brake Fluid DOT-3 (BF3SN) [5]
Power Steering Fluid......PS
Power Steering Fluid (PSFCN) [6]
[1] Oil must be formulated to meet GM standard GM4718M.
[2] GM P/N 1052931.
[3] This specification has been updated from Dexron II or III to
Dexron VI per a Technical Service Bulletin from the
manufacturer
[4] Limited slip identification: tag under cover-attaching
bolt. Models with limited slip use 4 oz & 4.7 oz on 2007-08
XLR, 2006-08 Corvette Except Z06, 2006-08 Z06 6.8 oz
GM P/N 1052358 additive or equivalent when fluid is
changed.
[5] Hydraulic Brake Fluid, DOT 3 P/N 12377967, Spec. 9986121
[6] GM P/N 1052884, Spec 9985010
FILTERS:
Oil Filter 25,000-Mile Ea Oil Filter (EAO23)
Oil Filter WIX 51036 Oil Filter
Transmission Filter WIX 58904 Trans Filter
CHASSIS LUBRICATION:
6-8 Fittings, 0 Plugs..........LB
Synthetic Multi Purpose #2 (GLC3P)
Synthetic Water Resistant #2 (GWR3P)
DOMINATOR Synthetic Racing Grease NLGI#2 GC/LB (GRGCR)
CAPACITIES:
Engine, with filter..........4.8 quarts [1]
Cooling System, Initial Fill..........14.8 quarts
AMSOIL Antifreeze and Engine Coolant
Automatic Transmission, 4L60-E Initial Fill..........5 quarts
Automatic Transmission, Total Fill
4 speed 4L60-E..........11.2 quarts
Manual Transmission, S6-40/ML9..........4.4 pints
Differential, Rear..........3.2 pints
[1] After refill check oil level.
TORQUES:
Oil Drain Plug.....16 ft/lbs
Manual Transmission
Fill Plug 26 ft/lbs
Drain Plug 26 ft/lbs
If you simply are removing your transmission oil pan and replacing the transmission oil filter will replace approximately 5 quarts of the total of 11 quarts as the converter and other areas hold about 6 quarts , that won,t drain, so if you don,t intend to mix old trans fluid and new fluid youll need to fill and run and drain and refill or flush the torque converter.
First, normal operating temps, without adding an additional large effective trans fluid cooler can rise to be as high as 245F-250F, which can rapidly burn the clutches,
with a high stall speed converter,being installed, you need to find and install a more effective trans fluid cooler or youll find that higher average fluid temp will reduce the transmission life span noticeably, lots of guys ignore this and find that they eventually need to replace the transmission, they get it rebuilt, replaced and the new trans doesn,t hold up for the same reason the original trans failed...the trans fluid is too hot!
rather than find this out the way many guys do and pay for several transmissions its smarter to instal an effective trans fluid cooler with a fan, and AN# 8 lines to the cooler. have a trans shop flush the trans converter, lines and replace the filter at reasonable intervals and if you can YOU SUPPLY THE TRANS FLUID AND WATCH IT BE USED, so they don,t substitute far less expensive inferior transmission fluid.
http://forum.grumpysperformance.com/viewtopic.php?f=71&t=662
http://forum.grumpysperformance.com/viewtopic.php?f=57&t=176
be sure you accurately measure the available room in the location you plan to install an aux trans fluid cooler , get as large a cooler as you can fit in the car with a powered fan, because keeping the trans fluid down near 170F significantly extends trans life

if you race the car as the extra rpms and stress quickly build higher heat, which can quickly destroy the internal clutches in a transmission, depending on if you race auto cross etc. EVEN Normal driving, can result in 220F. This goes for any year and model c4 corvette with a torque converter clutch.
Transmission fluid hydraulically Transfers power within the torque converter, provides almost all the cooling to your transmission AND LUBRICATES.
keep in mind that all oil and transmission fluids breakdown over time,and heat increases the rate it degrades , The lubrication properties are critical to friction band, clutches,and bronze bushings within the transmission.
Remember that fluid does almost all of the work in the automatic transmission,and as it wears it should ideally be changed about every 30K-35K miles along with the filter,AT A MINIMUM, and IDEALLY ONCE A YEAR or every 15K if you drive the car hard! a trans shop will generally charge about $100 to flush out all 11 quarts and replace it with new trans fluid, the more frequently the fluids replaced the less crap builds up as flushing the trans with new fluid removes a significant percentage of metallic dust and built up varnish.
therefore, less chance that your will experience problems.
yes you can remove the transmission oil pan, replace the trans filter and replace both,the filter and fluid, then disconnect the trans fluid cooler line and allow the engine to run for a few seconds to pump remaining fluid out into a catch pan and refill the trans several times to do a D.I.Y. trans flush but theres a minimal chance if your not careful youll burn clutches if you let it run low on trans fluid, a trans shop pumps new fluid thru flushing out the oil fluid as the trans is flushed under constant pressure
DO NOT, use a generic brand of Dexron 3 ATF. These cheaper trans fluids are not the same quality as the better brands and just above Dexron 3 standards, and will not have the lubricity, or cleaning , or heat resistive additive packages to correctly work within your transmission for the life of the fluid.
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