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2001 Ford F550 High Gear Problem

October 14, 2014 - Author: bartbarton

I have a F550 2001 7.3L diesel Manual Transmission 4WD.

Question:  zf s650 Serial # 8283850 1319050036 Transmission has 210,000 ZFS650_MTFRD059miles on it Transmission was in high gear when there was a bang and then it would not stay in high. I can hold it in high but only with very light throttle, otherwise it just pushes shifter to neutral. My question: would you think high or low dollar fix. what issues is this transmission facing with the miles on it. Will I trash it by continuing to drive it while I make a decision on what to do. Thank You for your time.

Answer:  The Over Drive gear is a common problem/ issue with the ZF 6 speed. Below we have listed the parts we believe you will need to repair, also we have provided a cost or a remanufactured dyno tested transmission. The transmission will have a one year warranty.

At 210,000 miles it will need the following at the very least… they also have an issue with wearing out the pilot area on the end of the input shaft also… we do have a kit for that listed at the bottom, here are the parts we recommend::

Bearing Rebuild Kit with Syncro Rings Ford (99-Up) (5.4L, 6.0L, 6.8L, 7.3L) MWT486WS $616.92


602G 5th Hub TRS434606-5 $84.94
642G 5th Slider TRS359642 $48.53


585G 5th Gear (54 T) MWT 1319-303-052 $234.25


Input Pilot Bearing Repair Kit (87-Up Except PTO) MWTPBZ73HD $59.95

Or a rebuilt unit Dyno Tested

Ford 6 Speed Transmission 4WD Diesel includes SuperDuty 1999-2003 MTFRD059 $2526.67


Core Deposit on above Transmissions $1500.00

Shipping charges will be added to either option, give Scott a call 888-824-2012 he can help you.

If you go to our web page and register you will be eligible for a discount:  You can see the other ZFS650 parts we can provide on our web site.

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ZFS650 2WD Transmission Conversion to 4WD

June 27, 2014 - Author: bartbarton

I have a 1999 Ford F350 7.3 L 2WD

Question:  Can I convert a Ford 2wd Zf S6-650 ZFS650_MTFRD059transmission to 4wd? Or would having a 4wd transmission require me to buy a new purpose built 4wd trans?

Answer:  We could supply you a rebuilt ZFS650 however it would be less expensive

To do the conversion. It’s a fairly common conversion you will need the following parts:

  • Our part number MWT1319-304-070 MAINSHAFT your cost $235.00
  • Our part number MWT1319-301-073 4X4 TAILHOUSINS $345.00
  • Our part number MWT0734-319-598 4X4 SEAL your cost $9.50 plus S&H.

If you need any additional technical help or help with the order just give Dan a call toll free 888-824-2012 he can help you. You can see the other parts we can supply for your ZF S650 manual Ford 6 speed transmission on our site.



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2001 Ford F250 with ZF 6 Speed, Input Shaft Wear

May 22, 2014 - Author: bartbarton

I have a Ford F250 7.3Lt 2001 with the manual ZF S650 transmission.


Updated Pilot Bearing Kit

Question:   I need to rebuild my zf 6 speed and I have some questions. First is your bearing rebuild kit a complete rebuild kit? I’ve never seen one labeled as a bearing rebuild kit. Second I read that people are putting the 6.0 pilot bearing in mine failed again and I saw you have a repair kit but little information on what all it is which would you suggest? and if it matters I have a luk clutch and fly wheel but that also may change. My other question is my input shaft is terribly worn and also has a lot of play. I’d like to get a new one Chryo treated as well but do you have anything to fix the input shaft bearing and keep it from wearing out so easily?

Answer:  We have see this problem a number of times the pilot bearing premature excessive wear or failure causing the input shaft

To wear at a rapid rate. Below is a list of item we can provide that you may want to purchase in order to overhaul the ZF S650 transmission.

  • Bearing Kit with Syncro Rings  your cost $637.87. This kit includes all major bearings, gaskets, seals and syncro rings
  • Needle Bearing Kit    your cost $134.94, may not be required, generally reused unless transmission has been run dry.
  • Input Shaft   your cost $165.00
  • Cryo Treating for Input Shaft $80.00
  • Pilot Bearing Saver Kit your cost  $59.95

The new pilot bearing kit will stop this failure mode.

Plus S&H. If you need additional information give Scott a call at 888-824-2012 he can help you.


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