strength of the 4r70w
07-23-2009, 09:45 PM
#11
5th Gear Member
Join Date: May 2007
Location: Smyrna, TN
Posts: 4,524
I am on quite a few Mark 8 sites and the stock 4r70w trans in the 93-96 Mark 8s have weak internals. The 97-98's are not much better, one of the most common upgrades for Mark 8 owners after adding a blower is a trans from a 03-04 mach 1. hell mine blew apart after 89,000 miles and the car has been stock its whole life. FYI my newly rebuilt 4r70w trans is only rated at 400 ftlbs and thats pushing it. There was over 32 upgrades to the 4r70w since my 95 was made.
Last edited by jrherald420; 07-23-2009 at 09:47 PM.
07-23-2009, 10:43 PM
#12
5th Gear Member
Thread Starter
Join Date: Feb 2007
Location: St. Charles Il, and ISU
Posts: 3,736
I am on quite a few Mark 8 sites and the stock 4r70w trans in the 93-96 Mark 8s have weak internals. The 97-98's are not much better, one of the most common upgrades for Mark 8 owners after adding a blower is a trans from a 03-04 mach 1. hell mine blew apart after 89,000 miles and the car has been stock its whole life. FYI my newly rebuilt 4r70w trans is only rated at 400 ftlbs and thats pushing it. There was over 32 upgrades to the 4r70w since my 95 was made.
07-23-2009, 11:23 PM
#13
5th Gear Member
Join Date: May 2007
Location: Smyrna, TN
Posts: 4,524
i was stating that to the guy that was saying get one from a Mark 8. i was just letting him know that the strongest factory 4r70w trans you can get is from a 03-04 mach 1 that will work with the 4.6 dohc and that guys that install a blower on there Mark 8's are normally installing a new upgraded trans the next week.
07-24-2009, 12:16 AM
#14
5th Gear Member
Join Date: Jul 2007
Posts: 3,731
i was stating that to the guy that was saying get one from a Mark 8. i was just letting him know that the strongest factory 4r70w trans you can get is from a 03-04 mach 1 that will work with the 4.6 dohc and that guys that install a blower on there Mark 8's are normally installing a new upgraded trans the next week.
that's because it isn't a 4R70W, it's a 4R75W and it's rated to 750LB/ft
03-25-2017, 02:26 AM
#16
Join Date: Mar 2017
Location: TX
Posts: 3
I am on quite a few Mark 8 sites and the stock 4r70w trans in the 93-96 Mark 8s have weak internals. The 97-98's are not much better, one of the most common upgrades for Mark 8 owners after adding a blower is a trans from a 03-04 mach 1. hell mine blew apart after 89,000 miles and the car has been stock its whole life. FYI my newly rebuilt 4r70w trans is only rated at 400 ftlbs and thats pushing it. There was over 32 upgrades to the 4r70w since my 95 was made.
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