351m trans
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351m trans
ive got a 82f350 with a 351m and 4speed with granny top speed is 45 to 55 is there anything i can do to get more top end without cutting low end perforance life a 5peed does a 5speed have granny in it and will it bolt up to a 351m advice needed please help thanks
Moderator
Joined: Jan 2001
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From: Virginia
Theoretically, a zf 5speed that is made for a 460 will fit. I haven't heard of anyone doing it, but the bellhousing pattern is the same, and since the bell on the zf is made onto the zf, you will have to get a zf that was behind a 460. You might have to do some head scratching to get the clutch stuff to fit up.
The zf does have a granny, and has the overdrive too.
Really, the cheapest way for you to lower the rpms would be to change the rearend ratio. True, this will cut your low end performance some, but I don't think you will ever get in a bind were you can't get going since you do have the granny gear. You might find yourself downshifting more than you normally would, but you will be doing that with the overdrive tranny too.
The really nice way to go would be to install a GV overdrive unit. This will give you up to 8 gears forward, and two reverse, since it's setup to split the gears like the big trucks. Only trouble is it's very expensive(close to $3000).
The zf does have a granny, and has the overdrive too.
Really, the cheapest way for you to lower the rpms would be to change the rearend ratio. True, this will cut your low end performance some, but I don't think you will ever get in a bind were you can't get going since you do have the granny gear. You might find yourself downshifting more than you normally would, but you will be doing that with the overdrive tranny too.
The really nice way to go would be to install a GV overdrive unit. This will give you up to 8 gears forward, and two reverse, since it's setup to split the gears like the big trucks. Only trouble is it's very expensive(close to $3000).
Fleet Mechanic
Joined: Apr 2007
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From: patricia ab canada
what gears do you have in the rear end.like franklin said that probably would be the cheapest way to go.i had a gto with 456 gears ,was good at the drags ,but on the freeway 50 mph.really sucked.my f250 has 355 gears and has good bottom end and cruses at 2500 rpm at 65.that 4 speed has a low 1st gear anyways.
Lead Driver
Joined: Dec 2002
Posts: 5,491
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From: Kuna ID
To the OP, you could also try running taller rear tires(if you have a 2wd) to lower your cruising RPM. It probably wont make a huge difference, but every little bit could help.
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From: Denver Metro Area, CO
There's an article on this site talking about the 351M/400 performance authored by Dave
Resch (aka Bubba):
https://www.ford-trucks.com/article/...00_Engine.html
Resch (aka Bubba):
https://www.ford-trucks.com/article/...00_Engine.html
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Joined: Nov 2007
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From: Denver Metro Area, CO
About the ZF having a granny gear or not; according to bronco.com the various ratios are as
so:
I suspect that quoted .078 final drive ratio on the NV3550 is a typo and s/b 0.78
There's lots of info out there on the ZF 5- & 6-speed trannies, let google be your friend.
From Transmissions | bronco.com
-ct
so:
Code:
Transmission Ratio Table 1st 2nd 3rd 4th Over Drive RAT 3 Speed 3.41 1.86 1.00 RAN 3 Speed 2.99 1.75 1.0 NP 435 6.69 3.34 1.79 1.00 T-18 6.32 3.09 1.69 1.00 NV 4500 5.61 3.04 1.67 1.0 0.73 NV 3550 4.01 2.32 1.40 1.00 .078 ZF 5 speed 5.72 2.94 1.61 1.0 0.76 C-4 Auto 2.46 1.46 1.00
There's lots of info out there on the ZF 5- & 6-speed trannies, let google be your friend.
From Transmissions | bronco.com
-ct
Methanoholic
Joined: Mar 2009
Posts: 6,442
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From: Maine (NorCal Native)
Ratios available from the MFG's of each Transmission, this is not an all inclusive list.
ZF S5-47
1 5,72 5.08 4.14
2 2,94 2.61 2.37
3 1,61 1.53 1.42
4 1,00 1.00 1.00
5 0,76 0.77 0.77
R 5,24 4.66 3.79
ZF S5-42
1 4.65 5.72
2 2.60 2.94
3 1.53 1.61
4 1.00 1.00
5 0.77 0.76
R 4.35 5.24
BW T18
1 6.32
2 3.09
3 1.69
4 1.0
R 7.44
BW T19
1 6.32 5.11 4.02
2 3.09 3.03 2.41
3 1.68 1.79 1.41
4 1.00 1.00 1.00
R 6.96 6.96 6.96
-Enjoy
fh : )_~
ZF S5-47
1 5,72 5.08 4.14
2 2,94 2.61 2.37
3 1,61 1.53 1.42
4 1,00 1.00 1.00
5 0,76 0.77 0.77
R 5,24 4.66 3.79
ZF S5-42
1 4.65 5.72
2 2.60 2.94
3 1.53 1.61
4 1.00 1.00
5 0.77 0.76
R 4.35 5.24
BW T18
1 6.32
2 3.09
3 1.69
4 1.0
R 7.44
BW T19
1 6.32 5.11 4.02
2 3.09 3.03 2.41
3 1.68 1.79 1.41
4 1.00 1.00 1.00
R 6.96 6.96 6.96
-Enjoy
fh : )_~
Moderator
Joined: Jan 2001
Posts: 56,965
Likes: 2,725
From: Virginia
One thing I do not like about the zf is reverse. It's way too high.
