It takes a smooth man to double clutch...

 

its not me Argo. my clutch engages 1" off the floor. yes ONE INCH. sometimes she just dont want to disengage. oh well it only does it when my g/f is mad. i dont know y, but them 2 seem to have a connection. when one gets testy so does the other. its wierd. thats a Ford for ya though.

 

Superbepro's info is good, but I find it interesting that different tranny's were available outside of publicized windows. For example, I've read where the NP435 tranny was used until somewhere in the 79-81 timeframe (i don't have the numbers right in front of me), but my 84 F-150 had one behind the 300. And Super's info says that the T-19's were all used in the 83-86 timeframe, yet my 89 F-150 has a T-19 (I believe it to be a 'standard' ratio).

 

goin from a t-18 to t-19.... does te transfre case match up? thats what im worried about. what out the quality... is the t-19 as bulletproof as the t-18? every so often there is a use for the granny low 1st (pullin out other truck outta mud and slow drag race @ all truck nationals).

 

The T19 is the T18's HD bigger brother, and it is a driect bolt in swap for the 18.
They're easiest found in 460 and diesel applications from 83-88 or so. Just look for a PTO plate on the drivers side(it has 2) and you'll know you've got one.

 

what is a PTO plate?

 

Oh yea... whats the diffeence bt a wide, standard and close ratio? like i see the number like 6.0 3.2 1.69 1.0 but i dont understand what they mean.

 

Drumline thats your gear ratios. First, second, third, fouth, in that order.
Multiply anyone of those ratios by your axle ratio and you get your "drive" ratio.
Then there's the effective gear ratio which is : Old tire diameter / New tire diameter x gear ratio. If your tires are the stock size you just divide that diameter by itself which equals 1

So for first gear(I'll use my current gearset):
your drive ratio is :6.0 x 3.50= 21:1 gear ratio
To find the effective gear ratio lets use a stock size tire.
29/29 (tire diameter) x 21 (1st gear drive ratio)= 21 gear ratio or:
29/32 (old tire size/new tire size) x 21= 19.65: 1 effective gear ratio

Well, you get the idea. Just plug in the appropiate gear ratios and you'll come up with what you need to know.
A wide ratio gearset will effectively do more work(torque) over a longer period of time. They use these kind of gearsets to haul heavy loads with, but they're not very fast and you really can't speed shift with them. Also you lose some rpm's in between gear changes. The standard is probably a gearset in between wide and close ratio gearsets with some benefits and disadvantages of both. The close ratio gearsets do less work in less time which is fine if you run your vehicle on the street a lot or if you have a fast car. By using a close ratio gearset you can keep most of your rpm's in between gear changes.

 

I want a stump puller 1st gear and don't care if its syncroed or not, I know how to double clutch. Problem is I now have a 5 speed overdrive in my '90 F150 300 and have heard that the conversion is not easy.

 

Drumline, to go just a bit further that 77', the ratios which you describe are "wide". I believe my t18 has a 6.32 low, or "granny", and it would be "wide". The t19 that came behind the 6.9 (and 7.3?) diesels had a 4.02 1st, and it's the one we're refering to when we speak of close ratio. Another difference: the "wides" have a difference of @ 1.7 between 4th and 3rd (the third you mentioned is 1.69), whereas the close t19 has a difference of 1.4 (3rd is 1.4). I'm repeating something I already said, but that is the difference between OD and direct in many overdrive trannies, and that makes this gearbox a great choice for some one who 1) wants to gear "long" for low rpm and economy, 2) drives only on regular roads, not trails or over big rocks, and 3) is never going to tow/haul more than 2500lbs or so. Otherwise, I think you'd want a granny box. I think you'll find 1.7 (more or less) is a very popular multiplier betwee gearbox ratios for light-medium gas-engine trucks.
Eclectic: If the conversion you want is not easy, I suspect it's because the your '90 has a hydraulic clutch (um -right?). Your 5spd is sourced from Mazda (um - right??), has no granny (um - I guess a lot, eh?), and is a light-duty unit (finally feeling confident!). If you want a granny, I think you could swap in a ZF from a similar F250-350, but it won't be as cheap as a 4 spd.

 

Just to second hedgeapple, I also believe the close ratio T19 would be a really good option for light-duty trucks that see plenty of city driving (fully sinc-gears) with ocassional and/or light loading. The RUG 4-speed OD trans in my truck has a pretty useless OD (4th) gear of 0.81 (compared to the 1.00 in 3rd, fairly distant from the 2nd gear of 1.84), which coupled to my 2.73 rear end ratio is mostly useless. Given these circumstances, I actually can only effectively use this OD (4th) gear at highway speeds in excess of 60-65mph. That is why I either change the trans (cheaper option) or keep the RUG-OD trans and change the rear diff. gears (to a 3.55; fairly expensive since I have to contract this out due to lack of tools and know-how) to make a more effective and efficient use of my truck and needs. Given the $ situation, I'll rather find and get me a CR T-19 (which in istelf will prove difficult as they are not as common as other heavy duty 4-speeds such as the T18).
Raul

 

superbepro... what killin u is the 2.73 rear. if u has 3.08 or 3.55, ud be sooo much better off. from what i hear the 2.73 is a dog on the streets. killer for highway, but dont race a geo metro.

77300I6 and hedgeapple - thank you guys. the 4.10s are killin me. i dont have stock tires. my stocks are hard to find... 235 85 r16 lol. i have 245 75 16's (rims n tires off a 97 F-250) and had 33x12.5 16.5 on her. Im def gonna save those posts for future reference.

 

Eclectic -

Just look around. My 84 had, and my 89 has a hydraulic clutch. My 84 had the NP435, and my 89 has T-19. You're largest hurdle will be getting the correct bellhousing. You might check with junkyards in small towns, and maybe even a little more up north (northern plains), seems like I saw a lot more 80's and 90's pickups with 4 spd's up there.

 

Drumline - check out High-Tec Retreading, they have a website. 235/85R16 is a standard truck tire, and they have them as retreads in a variety of tread patterns. Mine, delivered to my job here in Newton, were $255/set, which is 40% the cost of new. They're all Michelin "E" casings, they balanced with a minimum of weight, 32" diameter, and I've been happy with them.

 

Alright, let me pick some brains here. I found two 1986 F-150s at the local boneyard today. Both have aluminum topped cast iron case 4 speeds, one is a carbed I6, the other is an EFI 5.0L V8. Both are hydraulic clutch, and both are 2wd. Any ideas on what these trannies are? I want to get either a standard or wide ratio 4 speed for my truck. I want a synchro'd 1st gear, though, so I won't bite unless you think that they are T-19s or synchro'd NP-435s. By the way, I did see a PTO plate on the starboard (right) side of one of the transmissions. The yard was getting ready to close and they were both sitting at odd angles, couldn't get too much more detail than that.

Dave