Transfer box

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Hi All
Iv'e got a fourtrack and its just started slipping out of gear when 4l is engaged. it has never been a problem in the past, it goes into 4l easy but under power on climbs and really rough terrain it just suddenly slips out. Anyone one got any ideas as to what this could be and how to sort it out.
Thanks in advance

Transfer box

Allparts have a compleate one.
Phil 01706 849892 (oldham Lancs)
The 4Trac is compleate minus the engine & trim
Dave
www.winchman.com