Speedo Correction?
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1st Gear Member
Joined: Apr 2007
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From:
Speedo Correction?
Hey. I just put some Ford Racing 3.73's in my stock 8.8 inch rear end about a month ago. I knew my speedo would be off and it is by about 30%. (When my speed says 100 Km's/H its really 70 Km's/H) I went to a few local shops and I'm pretty sure the parts only 40 bucks or so Canadian from Ford. I know there's obviously cheaper places to get this part so if you guys could maybe give me a link or something of that sort to find out where I could get this and more importantly how dificult it is to install? Thanks. (1990 Ford Mustang 5.0 LX, Standerd T5 Transmission)
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Joined: Dec 2005
Posts: 22,374
From: Lil' Rhody
RE: Speedo Correction?
ORIGINAL: medium_jay
Hey. I just put some Ford Racing 3.73's in my stock 8.8 inch rear end about a month ago. I knew my speedo would be off and it is by about 30%. (When my speed says 100 Km's/H its really 70 Km's/H) I went to a few local shops and I'm pretty sure the parts only 40 bucks or so Canadian from Ford. I know there's obviously cheaper places to get this part so if you guys could maybe give me a link or something of that sort to find out where I could get this and more importantly how dificult it is to install? Thanks. (1990 Ford Mustang 5.0 LX, Standerd T5 Transmission)
Hey. I just put some Ford Racing 3.73's in my stock 8.8 inch rear end about a month ago. I knew my speedo would be off and it is by about 30%. (When my speed says 100 Km's/H its really 70 Km's/H) I went to a few local shops and I'm pretty sure the parts only 40 bucks or so Canadian from Ford. I know there's obviously cheaper places to get this part so if you guys could maybe give me a link or something of that sort to find out where I could get this and more importantly how dificult it is to install? Thanks. (1990 Ford Mustang 5.0 LX, Standerd T5 Transmission)
There are no combinations of the 8t drive that will accurately correct for the 3.73's. you need to go with either a 7t or 6t drive gear
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Joined: Dec 2005
Posts: 22,374
From: Lil' Rhody
RE: Speedo Correction?
Its actually not as bad a job as many people think it is. There are 8-10 bolts holding the tailshaft housing onto the trans case. you must remove the shifter, punch out a roll pin, unbolt the driveshaft, drain the tranny fluid, unbolt the tranny crossmember, lower the back end of the trans down, support the tranny and unbolt the tailshaft housing... then it slides right off.. there is a clip holding the gear in place, slide the whole thing off, and install a new gear...
clean the tranny, apply some RTV silicone, and slap it all back together
clean the tranny, apply some RTV silicone, and slap it all back together
3rd Gear Member
Joined: Dec 2005
Posts: 926
From:
RE: Speedo Correction?
i just had my trans rebuilt, and i got a 7t drive gear put in and along w/ the 23t speedo gear i already had
my speedometer is pretty much right on w/ 3.73's,heres the part # for the 7t drive gear... E3ZZ-17285-A
my speedometer is pretty much right on w/ 3.73's,heres the part # for the 7t drive gear... E3ZZ-17285-A
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Joined: Dec 2005
Posts: 22,374
From: Lil' Rhody
RE: Speedo Correction?
ORIGINAL: marx91
i just had my trans rebuilt, and i got a 7t drive gear put in and along w/ the 23t speedo gear i already had
my speedometer is pretty much right on w/ 3.73's,heres the part # for the 7t drive gear... E3ZZ-17285-A
i just had my trans rebuilt, and i got a 7t drive gear put in and along w/ the 23t speedo gear i already had
my speedometer is pretty much right on w/ 3.73's,heres the part # for the 7t drive gear... E3ZZ-17285-A
[IMG]local://upfiles/26017/23AC3750DD44451DBC65E93E75DA774E.jpg[/IMG]
Banned
Joined: Dec 2005
Posts: 22,374
From: Lil' Rhody
RE: Speedo Correction?
ORIGINAL: black89gt
hey adder.. up to an 89 has the 7th tooth drive gear right? And anything later than taht will be 8 tooth?
hey adder.. up to an 89 has the 7th tooth drive gear right? And anything later than taht will be 8 tooth?
good thing I know how to take out the drive gear.. hehe
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