Try screwing in your T in the modulator valve, or better still check and adjust the trans fluid pressure. There is a thread on the proper way to do this.
If that doesnt help the flaring problem then you may have look a bit deeper. If it has been doing it for 10 or 20k miles like that and being driven in conditions with a lot of gear changing, the trans clutches may be in very bad shape.

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Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving